flexible vac hold down device and tested

This is the place to post images of work produced using Aspire
Post Reply
stankern
Vectric Wizard
Posts: 669
Joined: Tue Nov 27, 2007 3:21 pm
Location: ontario canada

flexible vac hold down device and tested

Post by stankern »

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



also added a few tests using 2 vac clamps
Attachments
one.jpg
two.jpg
threee.jpg

rungemach
Posts: 13
Joined: Sat Aug 04, 2012 2:45 pm
Model of CNC Machine: Dolphin

Re: flexible vac hold down device and tested

Post by rungemach »

That is a very nice clamp design.

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

bob

stankern
Vectric Wizard
Posts: 669
Joined: Tue Nov 27, 2007 3:21 pm
Location: ontario canada

Re: flexible vac hold down device and tested

Post by stankern »

the orings came from lee valley tools less than 6.00 per package of 3

laconcepts
Vectric Craftsman
Posts: 244
Joined: Tue Jun 23, 2009 2:24 am
Location: Keithville Louisiana

Re: flexible vac hold down device and tested

Post by laconcepts »

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,
Kelly
Dyna CNC Plasma/Router
USAF-- Fadal 4020, Shopbot PRT 4X8

Bill I
Posts: 27
Joined: Fri Mar 02, 2007 9:29 pm
Location: Harrisburg, PA

Re: flexible vac hold down device and tested

Post by Bill I »

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
Bill I

User avatar
rscrawford
Vectric Wizard
Posts: 1102
Joined: Mon Jan 17, 2011 6:49 pm
Model of CNC Machine: CAMaster Cobra 408 ATC, ShopSabre IS408
Location: Wetaskiwin, Alberta
Contact:

Re: flexible vac hold down device and tested

Post by rscrawford »

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

User avatar
stephenr
Vectric Apprentice
Posts: 56
Joined: Wed Nov 03, 2010 3:43 am
Model of CNC Machine: Shopbot PRS Standard 48x96
Contact:

Re: flexible vac hold down device and tested

Post by stephenr »

Good information. Thank you.

Stephen R.

Post Reply