Off Topic Hobbies > Mechanical Engineering

Recommend me a machine shop/machinist for this part (USA, China)

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joeqsmith:
I used to just zip tie a discarded soda bottle with paper towels and holes drilled in the top.  Super light weight.    The only problem I had with it was my newer motors have a lot more blowby and it was a pain to remove and drain. 

My current one uses no filter except at the vent.   I just put a tray under it and drain it out between runs.   Quick and simple. 

TimNJ:
Thanks for all of your ideas and comments.


--- Quote from: bdunham7 on June 09, 2021, 05:31:41 pm ---So the goal is to simply make a longer version of the cup part?  Is that just for more capacity or for some other reason?  Do you know what material that part is made out of?  I think I've seen clear polycarbonate versions that are pretty long.

--- End quote ---

Yes...just to make more capacity, no other reason. The original part is cast zinc. Polycarbonate is the more populare type. I chose the zinc version because it would be subject to continuous high heat. I talked to the guy who gave me the drawing and we are working to put together a lower cost kit: http://www.conceptualpolymer.com/

Long story short, I think I'm just going to put my filters up on eBay, and go with his solution.


--- Quote from: andy3055 on June 09, 2021, 09:38:01 pm ---If you Google for New Jersey Machine Shops, you get a whole lot of hits!

--- End quote ---

Very true. In today's world, and for something pretty "simple", I figured being local might not even matter...and I didn't want to send dozens of messages to random shops if someone already knew someone who might take on the job.


--- Quote from: CatalinaWOW on June 10, 2021, 02:21:21 am ---If you want to do this yourself just substitute brass or copper for the aluminum material.  More expensive and heavier, but material costs won't be the issue.  You can easily solder these materials, probably good enough for 15 psi, or move up to silver solder or brazing.

Use of 3D printing has many issues.  Most extrusion printed 3D parts are pretty porous and you will have to come up with some way to seal them.  It can be done but finding sealants that are compatible with the plastic, can get into the pores and then not shrink on setting is a challenge.  Finally the thread question depends on the application.  I have had fairly good success printing threads, but there is a fair amount of surface roughness.  If your threads seal like plumbing threads there will be issues.  If the threads merely provide compression to an elastomer seal, or better yet just hold the part in place while an O-ring gland provides the sealing you should have no problem.

--- End quote ---

Thanks for the insight. Yeah, I have no real experience with 3D printed materials for anything other than small mechanical parts or enclosures. On the original assembly, the threads themselves do not do any sealing. As you say, they just provide compression against the buna-N ring on the top.


--- Quote from: Gregg on June 09, 2021, 09:10:58 pm ---It would be cheaper and easier to just purchase an automotive oil catch can already made similar to this:
https://www.amazon.com/dp/B06XK9PTP7
From my experience, coalescing filter elements have too fine of filter passages that would clog quickly with engine crankcase fumes and the replacement elements are really expensive.  I have used them on compressed air lines and soon discovered that the only way to economically use then was to install it after a standard filter/separator then a desiccant unit.

--- End quote ---

Well....you see, I was going to pick up one of these cheap tanks, and then I got sucked down the rabbit hole of believing that they are "not good enough" or at least "could be better". I read one too many anecdotal Amazon review saying "didn't do anything!" and I sold myself on a more elaborate solution.

What you saying about the coalescing filters is right in line with what Dave@ Conceptual Polymer has found. Now, he recommends a lower density particulate filter, and better yet, a particulate filter after a even lower density stainless/bronze mesh filter.


--- Quote from: joeqsmith on June 10, 2021, 03:16:17 am ---I used to just zip tie a discarded soda bottle with paper towels and holes drilled in the top.  Super light weight.    The only problem I had with it was my newer motors have a lot more blowby and it was a pain to remove and drain. 

My current one uses no filter except at the vent.   I just put a tray under it and drain it out between runs.   Quick and simple. 

--- End quote ---

Oh wow, that's a bigass catch-can...I suppose you made that yourself?

joeqsmith:

--- Quote from: TimNJ on June 10, 2021, 04:29:26 pm ---Well....you see, I was going to pick up one of these cheap tanks, and then I got sucked down the rabbit hole of believing that they are "not good enough" or at least "could be better". I read one too many anecdotal Amazon review saying "didn't do anything!" and I sold myself on a more elaborate solution.

--- End quote ---

I just have this picture now of some snake oil salesman claiming a bunch of horse shit about the purpose for it.  More horse power, better millage, improved performance.....  Some idiot buys into it and then you get the review, it didn't do anything....    :palm:

Its in the rules and required by the tracks.  You don't want to spread oil around causing down time.   


--- Quote from: TimNJ on June 10, 2021, 04:29:26 pm ---
--- Quote from: joeqsmith on June 10, 2021, 03:16:17 am ---I used to just zip tie a discarded soda bottle with paper towels and holes drilled in the top.  Super light weight.    The only problem I had with it was my newer motors have a lot more blowby and it was a pain to remove and drain. 

My current one uses no filter except at the vent.   I just put a tray under it and drain it out between runs.   Quick and simple. 

--- End quote ---

Oh wow, that's a bigass catch-can...I suppose you made that yourself?

--- End quote ---

Look at the catch can on a Top Fuel dragster.   Now those are big!   Yes, the can is home made to fit where there was room.  It holds about a pint which is plenty for my setup.   There's a baffle built into the can (used to be paper towel in the soda bottle) but the only filter I have is the vent, just to catch any mist.  Everything has a place and there is little room wasted.   

What are you doing that requires it?   What are you driving?   

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