# Pneumatic question

**URL:** <https://boards.straightdope.com/t/pneumatic-question/1002405>\
**Category:** Factual Questions\
**Created:** [June 2, 2024, 2:19am UTC](https://boards.straightdope.com/t/pneumatic-question/1002405 "2024-06-02T02:19:50Z")\
**Posts on this page:** 2\
**Page:** 2

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**Author:** ![TriPolar](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/tripolar/32/3008_2.png) [@TriPolar](https://boards.straightdope.com/u/TriPolar)\
**Post date:** [June 17, 2024, 7:52pm UTC](https://boards.straightdope.com/t/pneumatic-question/1002405/21 "2024-06-17T19:52:48Z")

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So you are talking about a cylinder and piston between 6" and 12" in diameter?

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**Author:** ![HoneyBadgerDC](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/honeybadgerdc/32/1033_2.png) [@HoneyBadgerDC](https://boards.straightdope.com/u/HoneyBadgerDC)\
**Post date:** [June 17, 2024, 7:59pm UTC](https://boards.straightdope.com/t/pneumatic-question/1002405/22 "2024-06-17T19:59:41Z")

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Yes, quite a bit of equipment already out there. I think mine may have some unique features if it works as planned. I was a little disappointed that the pvc inside bore is not quite as smooth as I had hoped. With the 12" bore it might be forgiving enough to use as is. I am starting with some rough numbers. For example, if 20# of weight will take no less than 5 seconds to go down with a closed orifice that might be enough seal to meet my needs if not I will have to go for tighter tolerance’s.

> [@TriPolar](#):
>
> So you are talking about a cylinder and piston between 6" and 12" in diameter?

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