K factor stays at .433 for everything...its your outside radius that is changing..your stainless creates a larger outside radius than mild steel because of the hardness. In other words if you are forming the same thickness of steel and stainless with the same tooling, your outside radius for the stainless will be larger than the mild steel (CRS). Never change the K factor. Keep it at .433. Its the inside radius that you want to change in the cad software. So, if you are achieving a .180 outside radius on .060 thick CRS then you want to use a .120 radius.... If you are achieving a .190 outside radius on .060 stainless then you want to use .130 radius...K FACTOR STAYS AT .433..Use an outside radius guage and see for yourself
@cadcamstuff
6 жыл бұрын
Thank you so much for sharing this! Straight from the shop floor where things gets done!! Best, Lars
@TheEngineeringToolboxChannel
5 жыл бұрын
I don't think this is entirely true. K-factor and radius BOTH change from material to material with air-bending. This is pretty well documented. K-factor is a function of the strain in the material. Strain is a function of stress and material properties. .433 is roughly the industry accepted average k-factor of all material types and grades, BUT all bends won't have this exact K-factor: www.thefabricator.com/article/bending/analyzing-the-k-factor-in-sheet-metal-bending. Your method may work and give you good results, but the K-factor does change based on material type, thickness, bend angle, as well as tooling used. Even if its slight. The fact that K-factors values are pretty forgiving is probably what allows you to use .433 and have good results. For example the difference in flat length between using a k-factor of .40 and .45 with .060" material is only .006". Even with .250" material the difference when using those two k-factor values is only .020" which (depending on the industry) isn't that much error the sheet metal world. I completely agree that you should measure your resulting radius though! That will affect the final bend deduction as much or more than the k-factor value used to develop the flat lengths.
@OneLiterPeter
7 жыл бұрын
Another great stream Lars! Of course I'm going to add something, Sorry. :) K-Factor is a constant and it's function is to, as Lars stated, account for stretch/shrinkage of the material when it's bent. There are plenty of sites online that teach you how to calculate the K-Factor for a given material but... you don't have to learn all of that (unless you want to). There are literally 100's of sites that will give you a table of the K-Factor for the material you want to use. So if you're designing a sheet metal prat... determine what material you want to use first, look up the K-Factor, plug it into Fusion and just design away. Sometimes you need to dive deep into a subject and other times, such as this one, the industry has already done the work for you. Hope this helps all the future sheet metal designers out there. :)
@cadcamstuff
7 жыл бұрын
Hi OneLiterPeter Thank you for taking the time to watch the videos! AND a great comment! Really appreciate it.
@PinballMan
7 жыл бұрын
I seen the new Fusion360 sheet metal add on and you already started to talk about it. Thanks for the info and quick videos to help us beginners out.
@cadcamstuff
7 жыл бұрын
Thank you so much PinballMan !
@justincmw
7 жыл бұрын
The way we figure out our k-factor at our shop for a specific material type and thickness goes like this. First get the material you want to test. For an example i will pick 11ga carbon steel. There are three parameters you need to get for the right stretch out for your material when it is unfolded which are material thickness, k-factor, and bend radius. So for 11ga carbon steel if I measure the thickness it is usually .115 so I will record that number as my thickness. Next step is to measure the length of the material you are going to bend. We normally laser cut a blank 6"x3" but the blank doesn't have to be that precision of a cut just you measuring has to be. So after my blank is cut I will use a mic and measure it exactly. It might actually measure 5.998 or 6.002 but all I need is the exact measurement and record that value. Next step is to bend the 11ga strip with the bending dies you will normally use for that specific material. We bend the strip in half 90 degrees or just tell the back gauge to be at 3. Here again the bend lengths dont have to be exact for the test just the measurements you will take after it is bent. You do need to try and get the part bent as accurately as you can to 90 degrees though. Once you have it bent to 90 degrees you need to use a mic again and measure the outside dimensions of each leg of your bend and record it which I usually do by writing the dimension on the leg I measured so I don't get them mixed up. For example if I were able to bend it exactly in half each leg should measure close to 3-1/8" Next step is you need a radius gauge. If you don't have one you really need to get one to do this accurately. With the radius gauge measure the inside radius of the bend as close as you can and record it. Now the next step you will need to go to your 3d modeling software and draw the bent part you have using all the measurements you took. Draw a "L" shaped sketch and dimension the lines using the dimensions you miced for the dimensions of the legs of your part after it was bent. For example 3.100" x 3.112". Tell the software you want the material to be on the inside of you sketch line and then extrude it 3" or how ever wide your test part is. The width doesn't really matter for the calculation you are trying to get. Next you need to define you material which fusion 360 calls a rule. Tell the material thickness to be what ever you miced you material to be then define your inside radius as what ever you measured with the radius gauges. Now flatten or unfold your model you drew and measure you overall length after it is unfolded. with the default .44 K facotor it should be sort of close but not exactly what you want. What you have to do now is change the k-factor value till the over all length of the unfolded part in the software is exactly what you measured the strip at before you bent it. In my experience i've never gone below .30 or above .50. Once you have the k-factor figured out save it in your rule then next time you are going to draw a part in 11ga carbon steel just select the rule and your k-factor will be saved for you.
@cadcamstuff
7 жыл бұрын
Thank you justin george That is an awesome comment! Have an awesome day! Best, Lars
@thetokcase7978
6 жыл бұрын
Thanks for posting Justin George! It's all common sense steps but would take a couple goes before getting that procedure nailed like you have. Thanks for saving me the time!
@echobravo5488
7 жыл бұрын
Absolutely PUMPED about this series (if it will be a series...😉)! I work at a sheet metal fabrication shop. We make tool boxes for pickup trucks as well as class 8 semi-trucks. We use Solidworks exclusively, but I can't afford that software and really have no access to it. Being that Fusion 360 is free, this opens up a whole new world of "personal" projects! I hope that you might touch on bend deduction, bend allowance, bend force tables, and the sort. The K-Factor is the ratio of the distance from the inside bend to the neutral axis and the thickness of the material. I hope that makes sense, and I haven't read through the comments to see if anyone else mentioned that, lol! I totally dig your videos! Keep up the good work!!! 😁
@cadcamstuff
7 жыл бұрын
Hi Elliott Blood Thank you for taking the time to watch the videos! Bend deduction and allowance are supposedly coming soon according to the development team. Love your feedback on the tool when you have had a chance to take it for a test run. Best, Lars
@luziusclement9392
6 жыл бұрын
Hi Lars, thank you for cleening up loose ends. I'm new to Fusion 360 and as it is, it's not so easy for a beginner. Up to now I was drawing things up with a very old Programm, also from Autodesk, called Autosketch 9. I find your Videos excellend, understandable and very competent. I'm sure I watch all of them one by one, and some more then once. Sorry about my english, my language is German, and Fusion 360 is in german and this brings smetimes a bit of confusion. Never mind, I get along fine. Comming from Switzerland and living in Italy (Tuscany), retired with a Workspace on the back of the house, including lathe, milling and so on. At the moment I'm constructing a little 8-station revolving toolchanger for my 7 x 14 lathe. And this brings me to a problem I could not solve. The internal shaft of this setup is to have 8 holes equally spaced on the circumference, longsides. I meen squer to the centre about 8 mm deep. No idea how to do this. My background: I used to work with DMG-Mori as a service technican, allmost 30 years. I know the whole story about CNC machining, right from the beginning. I hope this was not to boring, but understandable and with a minimum of spelling errors. Have a great Day, Luzius
@Elberto71
7 жыл бұрын
So glad sheet metal is active, as a rough guide I subtract 1 thickness for each measured edge, in this case 2 sides so subtract 5mm. Works well for working out "bend allowance" as we call it For external measurements
@bryandelarosa9878
7 жыл бұрын
Rob Bennett we do the same in our shop as well.
@cadcamstuff
7 жыл бұрын
Great advice! Thank you!
@pranavbharankar8590
3 жыл бұрын
thank you lars so grateful for the video
@lukeatkins9137
7 жыл бұрын
Thanks for doing this stream Lars. I've always wondered how this was calculated and what it's name was. I do acrylic fabrication and I think the principal for heat bending will be the same
@cadcamstuff
7 жыл бұрын
That is awesome to hear Luke Atkins .Thank you for watching the videos
@samiseghir3887
7 жыл бұрын
Great lesson! Thanks for this video!
@cadcamstuff
7 жыл бұрын
Thank you!
@mstoops69
7 жыл бұрын
Thanks Lars! Another great video!
@cadcamstuff
7 жыл бұрын
Thank you so much mstoops69 !
@Soulsmithing
3 жыл бұрын
I would like to point out the very conspirationish element here that this episode is #43 and the common k-factor is .433.. There has to be a link! ;-)
@cspotat
7 жыл бұрын
Is there a way to bend it, measure it and then calculate the K-factor or maybe later in the future input the result in the sheet metal rules?
@cadcamstuff
7 жыл бұрын
There might be some calculator out there that will let you do that. I have only known, bend, measure, tweak and repeat
@justincmw
7 жыл бұрын
see the comment I made above on how we figure it out at hour shop.
@gnanaMuru
6 жыл бұрын
How can I use Bend table in Fusion 360?
@scotttucker8662
6 жыл бұрын
The part laid out in the flat position I call "stretch out" when working in sheet metal... I always think, whats the OD, and the ID supposed to be and is the k-factor negligible (for thin material it usually is) for thick material it needs to be accounted for as well as the type of top and bottom dies on the brake press, changing these will make the stretch outs vary
@cadcamstuff
6 жыл бұрын
Hi Scott Tucker Thank you for watching! And for the great comment! HAve an awesome day!! BEst, Lars
@danilocancino6875
5 жыл бұрын
Hi Lars, thanks for your video. I got a question: Can K Factor value be higger than 1.0 ?? Or K factor value must be between 0 - 1 ?
@TORDesign
4 жыл бұрын
Can we use Fusion for twisting metal to design a complex curved sculpture made from flat sheets?
@aristotleintila1081
6 жыл бұрын
Hi Lars, I am a bit confused here. The K-factor should be the TAN of half of bend angle? This is the definition from AC43.13.1B Book (Aircraft Manual). Please clarify. Thanks!
@cadcamstuff
6 жыл бұрын
Hi Aristotle Intila Thank you for watching! I am not going to argue with an aircraft manual :-) I am just sharing the knowledge I have in my little head.
@IBHoevelbrinks
3 жыл бұрын
Has someone the values for the k- factor for copper and zinc (thickness of the sheets about 0.7mm)?
@kurahashidan6856
6 жыл бұрын
I am very new to Fusion 360. I used to use SolidWorks for little more than 10 years, but as you know it is far too expensive for retired guy to have a license. I used be a sheetmetal worker, but mainly worked as foreman, production manager and engineering. In Canada, I only worked in Stainless Steel food and medical equipment shops. The inner radius is dependant of the bottom tooling opening unless to tooling nose is bigger than calculated radius. Normally each shop is limited what they bend and tools they carry. So you can test piece to determine the K factor. Most of the Stainless Steel shop uses 14 ga to 20 ga. In order to do precise measure, you need laser cutter and good CNC press. We were using 1/2" open bottom tooling and inner radius is multipy by 0.156, K factor was 0.3715. Now this is not dependant of the thickness of maerial nor kind of material, ie 303 Stainless Steel or Aluminum. Now the 1/2" open is at theorical sharp. These are tested with SolidWorks but Fusion should be same. As you can see, we made Stainless Steel cabinets, sinks, nacorpsy table etc, and they need to be accurate. I used Cincinnati 2 meter x 4 meter 3500watt laser and Cincinnati 14' AutoForm and MaxForm CNC press Brakes. We used air brake system meaning tooling does not hit as bottoming or coining. All tools were 30 degree acute tooling. This system eliminated test bend. We used to have scraps all over brake from test bend but Cincinnati AutoBand bends perfectly every time no matter the angle. This is another story.
@cadcamstuff
6 жыл бұрын
Hi Kurahashi Dan Thank you for watching! And sharing your knowledge. Thank you!! Best, Lars
@tyjoda
5 жыл бұрын
In the K-factor charts, under radius what exactly is "0 to Thickness"
@pmanikantabalaji4476
5 жыл бұрын
Can we do flat pattern or unfold for step files
@Johncoffee2002
6 жыл бұрын
This time I was puzzled with your measurements / elaborations around 20min. into the video. The dimensions 70.47695 remain the same - at all times, regardless the K-factor.
@cadcamstuff
6 жыл бұрын
Hi John Coffee Thank you for watching! The K-Factor is not calculated until you activate the flat pattern. That is when the calculations shows. That is why you need to go out on the floor, cut a piece, bend it, and then measure to find what works on your bending machine. Hope this is helpful Best, Lars
@Johncoffee2002
6 жыл бұрын
Yes, thanks a lot Lars.
@TheEngineeringToolboxChannel
5 жыл бұрын
@@Johncoffee2002 Yep! the K-factor does not change the formed part dimensions. Only changes the flat length. :)
@rexmcgurk9792
7 жыл бұрын
Great job!
@cadcamstuff
7 жыл бұрын
Thank you so much rex mcgurk !
@idahopsycho1261
7 жыл бұрын
NIce job Lars!
@cadcamstuff
7 жыл бұрын
Thank you so much IDAHOPSYCHO !
@westec2058
7 жыл бұрын
My break man uses bend deduction. Example for .062 aluminum he uses a been the duction of -.104. Is there any easy way to add that to the sheet metal rules? Instead of messing with the K factor
@cadcamstuff
7 жыл бұрын
Hi WesTec Thank you for taking the time to watch the videos! Bend tables are supposedly being added to sheet metal. Not sure when they will be ready. Until then, I am sorry to say you have to deal with the big K. Hope you have an awesome day!
@rbrpulling
7 жыл бұрын
Thanks Lars!
@cadcamstuff
7 жыл бұрын
Hi rbrpulling Thank you for watching!
@BCRwheels
7 жыл бұрын
I love your videos, thanks for everything! i have a question about sheet metal in fusion. Is there a way to import a drawing that's a piece of sheet metal with a few bends, Can you import that file into fusion and unfold it within the sheet metal tab? I'm not offered the sheet metal button after i upload the drawing.
@cadcamstuff
7 жыл бұрын
Not yet :-). I know the developing team are working on this.
@BCRwheels
7 жыл бұрын
Awesome. This is going to be really helpful. No more guessing, or scrap parts when I get to the brake or shear lol Thanks for all your videos again man. They help me so much.
@darkracer1252
5 жыл бұрын
do you always have to start with a flat sheet? i basicly want to use it to create a pre bent piece and then unfold it to be able to measure the lenght. (i'm too lazy to do the math)
@conrat2000
5 жыл бұрын
Actually, that would be the preferred way for most. Design in 3D and unbend all of the parts at the end.
@col2szb
7 жыл бұрын
I am super new to Fusion. I have created a drawing of a rinse tank out of 304 stainless steel with the following measurements: 18 feet long, 4 foot sides, 12 inch radius in the two corners. I started with an open plain u shaped form. Long sides and bottom came out fine. My problem is I don't know how to add the flat end pieces. Can you help me? I am short on time.
@cadcamstuff
7 жыл бұрын
Hi Stephen, would love to help, but I am sitting by the pool on a family vacation. I would recommend that you post your question on the Fusion 360 forum. There are some really smart people there.
@DigitalDivotGolf
3 жыл бұрын
After at least ten month of people telling you the sheetmetalguy site is a scam why haven't you taken the sheetmetalguy link down? It's a scam!!!!!
@josephcarlat9414
3 жыл бұрын
ditto
@StephenBoyd21
7 жыл бұрын
The only K that I know is special K
@abhijitshinde1263
5 жыл бұрын
Can You please make playlist of all your livestreams ?
@cadcamstuff
5 жыл бұрын
Hi Abhijit Shinde Thank you for watching! Already done: kzitem.info/door/PL40d7srwyc_Mkgc5wvP_OfVel9aDkNkZ6
@fi2ng
6 жыл бұрын
Hi Lars, Can I unfold ,or project a 3d geometry to 2d?I mean imagine the inside tube of a kitchen paper.I have it in 3d and want to unfold to 2d to cut it in cnc. Or a hull of a boat where the pieces are curved and change geometry.In front and back are narrower and in middle wider. Thank you
@cadcamstuff
6 жыл бұрын
Hi fi2ng Thank you for watching! We do have sheet metal tools: kzitem.info/news/bejne/z4-mz6Npk4qQn4Y But, we don't have the option to flatten curved surfaces yet without some work arounds.
@bulldozerd9
6 жыл бұрын
hi Lars can fusion 360 make a flattned square to round transition in the sheetmetal mode
@cadcamstuff
6 жыл бұрын
Hi bulldozerd9 Thank you for watching! It this point, it can not....Would be an awesome feature though...maybe the future: forums.autodesk.com/t5/fusion-360-ideastation-request-a/idb-p/125
@DavidinEssexUK
7 жыл бұрын
Could we use sheet metal to design cardboard boxes, and if so could you do a mini tutorial.
@cadcamstuff
7 жыл бұрын
Yes, I have used sheet metal for laying out cardboard to ship parts in the past. I will put it on the video list :-)
@tommccaw3229
7 жыл бұрын
What about us Plexiglas guys...we need a spot in the material library. And I hazard a guess or K factor is just wild.
@adamfilipowicz9260
7 жыл бұрын
I agree, bending Plexi/Acrylic. also cutting the bends then flat
@cadcamstuff
7 жыл бұрын
You should be able to just rename one of the current metals to plexiglas.
@andyoaryoga7861
7 жыл бұрын
Question !! if sheet metal used for packaging, using cardboard, duplex, etc. how much K Factor needed ? since those material are thin and easy to bend. thx
@d.tharun4302
6 жыл бұрын
Hi Lars can you pls make a simple detailed car body pls pls in the sculpting area pls
@cadcamstuff
6 жыл бұрын
Hi come on guys lets take over the pros in gaming Thank you for watching! I know I should attempt this :-)
@Audio_Simon
6 жыл бұрын
Lars you might love this great funny video about sheet metal and K-Factor - kzitem.info/news/bejne/p6-O1neGj4Gja6g
@cadcamstuff
6 жыл бұрын
That guy is awesome! Thank you for sharing!
@starcitizenmodding4436
6 жыл бұрын
+1
@ScottMoyse
7 жыл бұрын
Here's a good blog post covering K-Factors Lars. designandmotion.net/design-2/manufacturing-design/sheet-metal-k-factor/ and at the bottom there is a K-Factor calculator.
@cadcamstuff
7 жыл бұрын
That is a really nice article! Thank you for sharing!! Great work as always on Design and Motion!!
@ScottMoyse
7 жыл бұрын
Lars Christensen the damn site is broken at the moment though. So please excuse the mess while I fix it over the next few days.
@spanksthx
7 жыл бұрын
Iff I want to send you an email, where do I send it too?
@cadcamstuff
7 жыл бұрын
send it to lars.christensen@autodesk.com I am on vacation at the moment so expect delay :-)
@gustavomoreno384
6 жыл бұрын
Hi Lars, I can create in fusión 360 sheet metal from body? Regards
@cadcamstuff
6 жыл бұрын
Hi Gustavo Moreno Thank you for watching! Not yet. Hopefully that function comes soon. I will buy whomever on the development team a steak dinner for that function :-)
@gustavomoreno384
6 жыл бұрын
Hi Lars, :) I think it's very good idea, Thanks for the Information that keeps me quiet waiting...
@gustavomoreno384
6 жыл бұрын
media.giphy.com/media/zyin7TYoGmLAs/giphy.gif
@darrenvosper634
6 жыл бұрын
www.custompartnet.com/calculator/sheet-metal handy calculator for the k factor
@cadcamstuff
6 жыл бұрын
Thank you Darren Vosper That looks like and awesome site
@ulyssesdewaegemaeker5673
6 жыл бұрын
Material thickness changes k-factor also?
@cadcamstuff
6 жыл бұрын
Hi Ulysses de waegemaeker Thank you for watching! Yes, you should test on different thickness'
@udw.boicot
6 жыл бұрын
Thanks Lars, U rule!
@elmariachi5133
6 жыл бұрын
I can use Maya, Cinema 4D and even Blender, but Fusion 360 is unusable horror to me.. Can't you give this tool some decent GUI?
@cadcamstuff
6 жыл бұрын
Sorry to hear that. I assume this is the habit of mechanical engineering software
@elmariachi5133
6 жыл бұрын
There are things like a persistant coordinate display missing. Also copy and paste actions are implented in an hard to understand way . sometimes they work, sometimes they don't and there's no feedback why. Also sometimes you can move lines/shapes/objects, sometimes you can't, but there's no visible indictator telling why. And the missing choice between local and global coordinate spaces makes it even harder to use.
@jerrylambert9209
4 жыл бұрын
Lars: I have a sheet metal part that I have a print of but I cant figure out how to draw it and unfold it, if I email you the print can you help?
@jbeck66
4 жыл бұрын
SheetMetal Guys web page is getting redirected to what is likely a scam site.
@bigfilsing
7 жыл бұрын
got to 2:30 and found myself screaming "get on with it " Dont care about last monday on next tuesday or .........................
@cadcamstuff
7 жыл бұрын
Sorry, Wish I could give you back your 2:30 minutes....
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