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rlrhett
 Post subject: Foam Cord
PostPosted: Tue Nov 13, 2018 11:30 am 
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Koa
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I know this has been asked before, but can anyone tell me what kind of foam cord to use for vacuum hold down jigs (HDPE)? I’ve seen people say to get it at McMaster-Carr, but they easily have a dozen variants. I have no idea what to get. Joewoodworker sells foam tape for their hold down jig kit, but he says he doesn’t recommend it for CNC because it may shift (wtf?). So I’m at a loss.

Thanks!


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ballbanjos
 Post subject: Re: Foam Cord
PostPosted: Tue Nov 13, 2018 4:39 pm 
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I use Ultra-Weather-Resistant EPDM Foam Cords from McMaster Carr, both 1/4 inch and 1/8 inch depending on the application. It works great.

Dave


These users thanked the author ballbanjos for the post: rlrhett (Tue Nov 13, 2018 4:42 pm)
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Andy Birko
 Post subject: Re: Foam Cord
PostPosted: Wed Nov 28, 2018 5:12 pm 
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Same as Dave

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Bob Garrish
 Post subject: Re: Foam Cord
PostPosted: Tue Dec 18, 2018 9:45 pm 
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I used neoprene foam cord. Basically equivalent to EPDM in every way that matters for this application.

You want it being crushed down into a channel, so the part is sitting on the fixture rather than floating on the foam. That's why tape is a bad choice for vacuum fixturing.

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david farmer
 Post subject: Re: Foam Cord
PostPosted: Tue Dec 18, 2018 10:52 pm 
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