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Custom CNC Services

Old 05-23-22, 05:38 PM
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Entropy_S
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Custom CNC Services

Kind of an odd ball question, but are there folks here who own or operate CNC machines that can do custom part requests? For example, I have an older mountain bike which has a 3x chainring and I want to fit it with a chainring guard and/or bash ring. Thing is, I donít want to remove the outer chainring (making it a 2x) in order to do this, as I want to keep all three gears in place.

For reference, my MTB uses a 3x chainring with four bolt holes, with the biggest gear being 42-teeth, and a BCD of about 135mm.
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Old 05-23-22, 08:14 PM
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Sure there are hobby people w/ CNC stuff, although a one off can be easier to make on a manual machine often The Home Shop Machinist & Machinist's Workshop Magazine's BBS and Forum list | The Hobby-Machinist are two machine tool work forums I follow. Then there's the on line contract services like CNC Manufacturing, Fast Quotes & Free CAD | eMachineShop to consider.

When I read threads like this one I do wonder if the OP understands the real life cost of such a project. Andy
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Old 05-24-22, 04:57 AM
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Design the part you want in CAD and send it to someplace like https://www.xometry.com/ to have it made. I think you'll be shocked at the price for a single machined part. It seems to me that your issue would be less of finding a bash guard and more of finding chainring bolts long enough to go through 4 rings and the crankarm.
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Old 05-24-22, 05:16 AM
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I find arguments against 2x to be less than compelling. Are you sprinting in the pro peloton on your mtb?
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Old 05-24-22, 05:35 AM
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Originally Posted by dsaul View Post
Design the part you want in CAD

The second most difficult part of the project.... after learning the CAD program. Even a free/cheap simple one like Sketchup, is non trivial. Solidworks > fuggetaboutit.

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Old 05-24-22, 06:55 AM
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designing a chain ring in solidworks is on the list of things to do. After designing some lugs to be 3d printed.
Considerably after.
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Old 05-24-22, 06:57 AM
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Here is a bash guard that will fit a 4 arm 104 BCD crankset, which is what the Truvativ Isoflow 3.0 should be. https://www.ebay.com/itm/11311473077...Cclp%3A2047675

How to mount it will be a challenge and I question the need for such things. In 20 plus years of off road riding, I've only damaged one chainring.
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Old 05-24-22, 09:19 AM
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Here's the last bent ring I did, also the first Don't think a bash guard would have made any difference. Andy
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Old 05-24-22, 08:16 PM
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Originally Posted by unterhausen View Post
I find arguments against 2x to be less than compelling. Are you sprinting in the pro peloton on your mtb?
Well, no. The MTB is older, true, and I can't see burying the bike for a new one and/or replacing the entire crankset if there's a soul out there looking for CNC or even 3D printing work.
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Old 05-25-22, 06:41 AM
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Sorry for belaboring this. You can get 2x chainrings and a bash guard for that crank, I'm not advising you to discard the bike. It's just that I suspect you don't really need the 48 or whatever it is and that solves the problem. The whole world is going to 1x on mtb for pretty good reasons. But that means a whole new drivetrain, whereas 2x doesn't. Unfortunately, only 1x is easy to get. At least that was the case a couple of months ago when I tried to replace the 2x chain rings on one of my mtb cranks. It was for my gravel bike, so the crank having 42/28 chain rings works pretty well, and I didn't want to get a new drivetrain. I didn't search amazon/ebay/alibaba though, might be able to get parts there.

There used to be a guy that machined chainrings that hung around on a couple of bike related forums. He also had some contact with a CNC community I'm part of. I think that he started Wolftooth, but I can't find any evidence of that. Even if I'm wrong about who that was, it took him quite a bit of effort to get to the point where he was making usable chain rings. It's a lot of effort if you aren't doing it already.

You're actually asking for design/process development/build help so probably nobody is going to want to do it. My friends and family rate on that would surely be enough to buy a mountain bike at a bike shop.
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Old 05-25-22, 01:13 PM
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Originally Posted by unterhausen View Post
You're actually asking for design/process development/build help so probably nobody is going to want to do it. My friends and family rate on that would surely be enough to buy a mountain bike at a bike shop.
You're making an excellent case in convincing me to just get a new (or new to me!) mountain bike, LOL!
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Old 05-25-22, 01:51 PM
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I can help with the CAD design if you wish
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Old 05-25-22, 02:37 PM
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Originally Posted by dsaul View Post
Design the part you want in CAD and send it to someplace like https://www.xometry.com/ to have it made. I think you'll be shocked at the price for a single machined part. It seems to me that your issue would be less of finding a bash guard and more of finding chainring bolts long enough to go through 4 rings and the crankarm.
I do things for a decent price. but the hard part is getting the cad file.
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Old 05-25-22, 06:09 PM
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Originally Posted by Andrew R Stewart View Post
Here's the last bent ring I did, also the first Don't think a bash guard would have made any difference. Andy
good job on that
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Old 05-25-22, 06:10 PM
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Originally Posted by Entropy_S View Post
You're making an excellent case in convincing me to just get a new (or new to me!) mountain bike, LOL!
that is called win win N+1
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