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Old 06-09-2011, 08:37 PM #1
VS1GINGER
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Tolerances

I am in the process of designing a marker, as of now its just concept sketches and ideas but I'm getting ready to do the CAD drawings of a prototype. I plan on using a Merlin Extrusion for the body and already have a template of one drawn and saved. My question is what this, what should the difference of the radius of a bolt and ram rod be from the bore radius they are placed in? I would simply take these measurements but my calibers are off and I keep getting different readings. Lastly what are some general tolerances I should be aware of?
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Old 06-09-2011, 10:45 PM #2
y0da900
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This is a good starting point for anything having to do with o-rings. There are charts for both static and dynamic seals that you will want to look at. Read the section on stretch of the o-ring and the resultant decrease in cross sectional area related to diametrical stretching and you will get a decent idea of how you can load o-rings to fit the gaps in the sizes. It is somewhat common to use a smaller o-ring than the ones mentioned in their charts (typically 1 or 2 standard sizes) in a slightly larger ID groove to provide some stretching of the o-ring for seals in dynamic applications.

Parker o-ring design guide
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Old 06-10-2011, 11:31 AM #3
VS1GINGER
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Thanks a lot, this handbook has much needed information.
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Old 06-12-2011, 05:56 PM #4
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Next question lol, how large should a dump chamber be for a marker? Im sure this varies with pressure and layout but Im a poppit guy and have no real experience with spoolies/lp markers.
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Old 06-12-2011, 06:01 PM #5
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For a prototype, at least 1 cubic inch. You can always cram something in the dump chamber to suck up unnecessary volume, it is a PITA to make it bigger. 1.5 cubic inches is probably a safe spot to start as a completely average system should typically be able to run with that volume at or below 150psi making it work with a wider range of solenoids, other trigger valves, and fittings. Obviously that is a huge generalization, but that is for a gun with average efficiency.
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Old 06-21-2011, 09:16 PM #6
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Generally speaking I try to tolerance as loose as possible. Most parts are +/- 0.005" but a few are as tight as 0.002".

Hope that helps.
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