flexible vac hold down device and tested

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flexible vac hold down device and tested

Postby stankern » Wed Jul 31, 2013 12:07 am

This design is the best so far as with different o rings you get different hold down techiniques
with 4 of these hold downs ,you7 get a lot of vac power to hold a large surface area
Took about 40-45 mins to make

http://youtu.be/rSQvrg2TKzE

also added a few tests using 2 vac clamps
Attachments
one.jpg
two.jpg
threee.jpg
stankern
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Re: flexible vac hold down device and tested

Postby rungemach » Wed Jul 31, 2013 4:36 pm

That is a very nice clamp design.

What size o rings are you using and where did you source them from?

bob
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Re: flexible vac hold down device and tested

Postby stankern » Thu Aug 01, 2013 12:17 am

the orings came from lee valley tools less than 6.00 per package of 3
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Re: flexible vac hold down device and tested

Postby laconcepts » Thu Aug 01, 2013 12:53 pm

Great job..
I assume the materials from AllStar gaskets would work as well. Those O Ring gaskets very well though.
It the Aspire file on your clamps something that you would be willing to share?

Again, Great job,
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Re: flexible vac hold down device and tested

Postby Bill I » Sat Nov 18, 2017 8:20 pm

Stan
I really like your Vac hold down.
I have made several of my own but nothing like yours.
Would you be willing to share the file?

Thanks
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Re: flexible vac hold down device and tested

Postby rscrawford » Sun Nov 19, 2017 2:53 pm

That is a classic vacuum pod design!

A couple of suggestions if you want a vacuum hold down for very accurate work.

There needs to be a positive stop, so the Z-height is always accurate. The easiest way to do this is to have a gasket that will compress enough that your workpiece sits directly on the vacuum grid. If the workpiece is sitting directly on the gasket with no positive stop, then the z-height will vary depending on the strength of the vacuum (the gasket can deform unevenly).

To go along with this, you want the vacuum hole to be in a groove, rather than on the top.
Russell Crawford
http://www.cherryleaf-rustle.com
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Re: flexible vac hold down device and tested

Postby stephenr » Thu Nov 23, 2017 3:35 am

Good information. Thank you.

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