Is the z motor mount delrin?

discussion of design changes / improvements / suggestions
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willo
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Is the z motor mount delrin?

Post by willo » Mon Sep 10, 2012 2:47 pm

Is the z motor mount delrin? I'm going to make some bearing holders for my dual belt drive and I'd like to use the same material.

I was going to mount my motor on spacers and use a zero backlash to connect the rod to the motor. However I just realized that I can simply place my shaft drive in place of a pair of idler wheels. Then I can simply use three pulleys for the y drive and eliminate the connector.

jsbannis
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Re: Is the z motor mount delrin?

Post by jsbannis » Mon Sep 10, 2012 3:08 pm

I think it may be HDPE or UHMW, some sort of polyethylene
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edwardrford
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Re: Is the z motor mount delrin?

Post by edwardrford » Mon Sep 10, 2012 3:23 pm

Hi Willo,

It is indeed Delrin.

-Edward
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jsbannis
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Re: Is the z motor mount delrin?

Post by jsbannis » Mon Sep 10, 2012 5:03 pm

edwardrford wrote:Hi Willo,

It is indeed Delrin.

-Edward
I stand corrected :)

Does the Delrin offer advantages over UHMW for a motor mount? I thought the low coefficient of friction was Delrin's main advantage, and it doesn't seem like the motor mount requires this. Just curious, IANA materials engineer, so I'm new to design choices in plastics.
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edwardrford
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Re: Is the z motor mount delrin?

Post by edwardrford » Mon Sep 10, 2012 5:07 pm

For a motor mount, I would use UHMW or HDPE. It's easy to machine, stable, and costs less than Delrin, plus as jsbannis said, Delrin's main advantage is it's low coefficient of friction, which prevents it from wearing as quickly as UHMW or HDPE. For a motor mount, there's no need to worry about wear, as it's a static piece :-)

-Edward
Shapeoko 1 #0 - a couple of upgrades.
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willo
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Re: Is the z motor mount delrin?

Post by willo » Mon Sep 10, 2012 11:16 pm

Yeah, I have some hdpe cutting board scraps that I'll use to make em. Once I'm happy maybe delrin for the finished version.

willo
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Re: Is the z motor mount delrin?

Post by willo » Wed Sep 12, 2012 12:27 am

argh.
Slight delay on this as my power supply has gone out. I've ordered a new used 24v supply to get my other cnc going.
Meanwhile, I also forgot that I'd broken all my 1/8" end mills on my mill...
I think I'll use the extra days to get some 1/4" hdpe rather than cutting down the 1/2" I have.

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Re: Is the z motor mount delrin?

Post by edwardrford » Wed Sep 12, 2012 5:51 am

I stand corrected! IC pointed out to me that I had misspoken on this thread. The z-axis motor mounts are made from regular 1/4" UHMW!

My brain doesn't work sometimes...

-Edward
Shapeoko 1 #0 - a couple of upgrades.
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jsbannis
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Re: Is the z motor mount delrin?

Post by jsbannis » Wed Sep 12, 2012 1:02 pm

IC and I both have older machines with the white z mounts. From build log pictures it seems like some of the newer machines have a black plastic mount. I don't know if it's still the same material or not.
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