I think it was smart testing it the way you did. I wonder how many load cycles you can get out of it before it starts to break down? I'm sure if you're just using it once every couple of months for an oil change you'll likely never get there, but I am curious.
@FunctionalPrintFriday
2 жыл бұрын
Since I'm loading it at 1/10th the weight it started to deform at, I think a long, long time, but I'll update this comment if it changes
@Matt-ji2sy
4 ай бұрын
This is curious...my factory scissor jack does split around each side of the pinch weld, but it DOES actually sit the pinch weld down onto the scissor jack head, before the outsides of the jack would rest onto the actual chassis. Technically, the area outside the pinch weld on the chassis is actually a painted surface, so that could be damaged if the jack head was actually touching that part. Also, the strength of the lift point on the vehicle appears to be the actual pinch weld itself, so I'm thinking the jack head, and added pad, would need to actually contact the pinch weld itself, rather than the chassis on either side of it. Interesting...
@MrHotrodf1
7 ай бұрын
Love the idea here but you are assuming all the force is always exactly vertical. At first that doesn’t seem like a bad assumption but when working on a car sometimes you do impart some force one way or another in the lateral direction. I would feel a lot better about this concept if the tpu part was also pla or asa to give more support in directions other than perfectly vertical. When lifting we usually use a FOS of at least 4:1 meaning you’d want to support 8T here to be safe. Just food for thought.
@howabout2138
6 ай бұрын
tip for future is if you want stronger prints, do not increase the infill (I mean maybe increase infill % aswell) but mainly focus on walls, the more walls you add the stronger the part, if you want to make super strong part, sometimes 10 or 15 walls with 30% infill would be stronger than 2 walls 80% infill
@oafboy182
Ай бұрын
Thanks for this. I can't wait to try it out. I need to rotate the tires on the wife's car so I need to raise the whole thing off the ground. 2 of my jack stands have a much deeper V shape than yours that will clear the pinch wend but the other 2 I have are just like yours. I'm going to print these and give them a go.
@bmestel
Ай бұрын
love seeing you use hatchbox as well. i been using it pretty much exclusively for a while now its good stuffs
@D70X1C
Жыл бұрын
nice idea, thanks for sharing! Any reason not to print the entire jack block out of PLA?
@FunctionalPrintFriday
Жыл бұрын
The TPU is a 'softer touch' on the car, and in the event the PLA does collapse, the TPU cover would still end up cushioning the car as it settled down onto the jack itself
@spasecookee
2 жыл бұрын
So my question would be, what about printing the entire thing in PLA as one piece? I've been using a floor jack and rubber plate on the pinch welds, but I see now that is still a bad idea.
@FunctionalPrintFriday
2 жыл бұрын
Great question! My thought process was that the TPU outer would still cushion the car and help 'contain' the PLA if it started to fail. Note that an important element of the design is that the pinch weld is still in between the high points on the jack, and that the distance to the jack casting is minimized so that in the event it does fail, the car only has ~5mm to go before the jack stops it. Pinch weld might take some damage, but the human under the car won't.
@redsand128
2 жыл бұрын
I would use PETG, or something more heat resistant, unless you're in a cool garage I wouldn't trust PLA in the summer.
@FunctionalPrintFriday
2 жыл бұрын
@@redsand128 I think PLA starts to soften a bit at ~50C/122F. Should be ok for the garage, but could be an issue if you store in in your car parked outside in the sun on a hot day. In my experience, under compression, PETG tends to yield before PLA, but maybe I should test this.
@Londrino
Жыл бұрын
Good to see testing showing that it can support way more weight than necessary. I would have guessed that solid TPU would have been totally fine, but of course I didn't consider lateral deformation either. The two part design looks perfect!
@FunctionalPrintFriday
Жыл бұрын
thanks, I thought the same thing about the TPU part initially
@paulwary
Жыл бұрын
Glad I found your video. I am thinking about doing similar with just PLA. One thing that makes me nervous about your design is the height of the piece above the jack stand bearer top. I'm thinking about having the pinch weld situated in the middle of the bearer in the curve, and design so it supports from both sides and the pinch weld after some deformation. Worst case, the printed piece splits and the pinch weld is still centred on the jack stand where it cannot tip or slip off. Better still, cut a rectangular hole in some 40mm square steel pipe to slip over the bearer, and design the printed piece to sit snugly between the pipe and the bearer. (Of course you also need to cut a slot in the pipe on the other side.)
@FunctionalPrintFriday
Жыл бұрын
The pinch weld slot isn't centered on mine because the weight actually bears on the slightly raised pad behind the pinch weld (on the car). It's hard to see in the video, but the pinch weld sits deep enough in the slot that it'll be captured in the jack stand if the adapter fails. Checkout this vid for another way to do this for bigger stands that I prototyped in plastic, but fab'd in steel tube: fpfdesigns.com/054_prototyping_parts_for_metalworking.html
Пікірлер: 17