The plastic is likely nylon. Nylon is very durable and slippery, which is probably why you see less wear on it than the metal gear. I think if the gear was ABS, it would shear the teeth off of it almost instantly.
@navaho5430
5 жыл бұрын
They are pretty tough I've got one on my 9X20 lathe its a sacrificial gear the only time I stuffed it was when a rag got caught up and it striped the teeth.Yes my fault I have put 1000,s of hours on the lathe same as my mill cheers.
@JasonRoy21
8 жыл бұрын
Thanks for taking the time to show the gears in the g0704 as I have not recieved my G0765 yet. Im guessing my g0765 has some plastic gears in it as well. I was thinking about making some steel gears as replacements but I was also wondering if the plastic gears are purposely used as an intentional weak point. In case the machine gets jambed, the gears shred instead of shafts shearing ...or something like that. ps im no engineer, just a guess. I would like to know for sure before I take the time to make steel gears, Any thoughts on that?
@FrancoCNC
8 жыл бұрын
Well, the plastic gears will definitely break before metal ones will and this may provide a measure of protection if you have a crash. All of my machines have plastic gears driving the spindles in some shape or form and I haven't had a problem with them. I plan on running them until I have a reason to change.
@JasonRoy21
8 жыл бұрын
I think imma do the the same. :)
@BisonWorkshop
8 жыл бұрын
it wouldnt seem like the plastic gear would hold up. but apparentlly they do. lol. did you make the gear.
@FrancoCNC
8 жыл бұрын
+Bison Workshop Plastic gears are a cost cutting measure, for sure. However, I've not had any bad experiences with them - so far. I'm not sure why, but the brass gear has more signs of wear than the plastic gear. These are the factory gears.
@BTUvsCAL
5 жыл бұрын
I replaced mine with 37 tooth steel gear , happy since then
@theresepurdy8859
2 жыл бұрын
Where did you get the metal gear from? Thank you
@BTUvsCAL
2 жыл бұрын
@@theresepurdy8859 These were on Ebay but discontinued I believe..."maybe" you can find used ones though
@i-extruderdispenser1094
7 жыл бұрын
Hi, what is the material of plastic gear ? Is it Derlin (POM) ? Regards
@FrancoCNC
7 жыл бұрын
I-EXTRUDER Dispenser I'm not fully certain, but I suspect the plastic gears are ABS.
@i-extruderdispenser1094
7 жыл бұрын
Thank you :)
@johnhajdu4276
6 жыл бұрын
Greetings from Hungary! For those, who doesn't understand why milling machines were built up with plastic gears, I have the answer: 1. Reason According to the standards, every household machine with universal motor (brused dc motor) has to be isolated from the other parts of the machine. Thus if the copper winding burns thru, or the carbon brush is luckless broken, and the 230V (in Europe and Asia) will be on the motor shaft, because of the plastic gear, which acts as an isolator, the other parts of the machine (eg. housing of mill) are not under voltage. (so you can still touch the machine it safely) That means if you change this gear to a steel one, you risk your life by a malfunction. If you do it, you must use at least a Ground Fault Interrupter (GFI) at the supply of the machine. Please think of your child who touches the machine, and you are not there to save him/her. If the milling machine uses AC induction motor, there is no plastic gears because this kind of motor is not that dangerous. 2. Reason Plastic gears doesn't need much lubrication and are more or less silent. Normally steal gears which are in a transmission have always a lot of transmission oil inside to avoid being too hot, and damping the noise. Disadvantage of oil is the reducing efficiency.
@bobsimpson3661
6 жыл бұрын
Very good point. I was looking into buying steel gears. But maybe now I will rethink the whole idea.
@brisjare
5 жыл бұрын
This is a dumb answer and isn't correct, plain and simple plastic is cheaper and quieter, so part of your comment is okay. But the stator the windings go on are connected to the housing through the steel bearings at the end of the motor housing and then mounted in the of the machine, I know how motors are and I just pulled mine apart thinking I had a motor issue before finding out I stripped this plastic gear. The 110 or 230 volts would never go to the chassis because it powers the vfd variable frequency drive to a dc motor, why because it can be reversed direction and you are less likely to be shocked by dc than ac : see Tesla vs Edison power wars thats was Edisons claim, and the power to the windings just creates a magnetic field, if you burned out the winding there just wouldn't be any where for the current to travel like burning out a fuse and the motor would stop, same thing with stuck brushes would just stop, I've replaced numerous brushes the same.
@BTUvsCAL
5 жыл бұрын
@@brisjare I replaced mine with 37 tooth steel gear , happy since then
@marmac567
3 жыл бұрын
@@BTUvsCAL you will strip the internal hi lo plastic gears now
@BTUvsCAL
3 жыл бұрын
@@marmac567 have been working "just" fine
@brettgodfrey9536
2 жыл бұрын
What do you call wear on the brass gear is actually poor machining during the manufacturing process.
@Amerikanin2numarali_ustasi
4 жыл бұрын
Replace that plastic gear w/ steel gear and be done with it
@marmac567
3 жыл бұрын
then the plastic hi lo gears strip
@theresepurdy8859
2 жыл бұрын
Therese Purdy 4 hours ago Where did you get the metal gear from? Thank you
@Amerikanin2numarali_ustasi
2 жыл бұрын
@@theresepurdy8859 ebay
@theresepurdy8859
2 жыл бұрын
Do you have a link fpr me to the gear?
@Amerikanin2numarali_ustasi
2 жыл бұрын
@@theresepurdy8859 gone now but it was $395...I got two just in case but I used one for years and NO STRIPPING ANYTHING
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