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  #11  
Old 02-20-2017, 10:12 PM
rcrawford rcrawford is offline
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That pump will definitely do the job, maybe even a little overkill for a fixture of that size. But overkill is good, because you can use less expensive fixtures and not worry about getting a perfect seal.

The spec sheet looks like you'll be getting 20"hg even with 50cfm of leakage. If you use gaskets, you'll probably be getting 20cfm of leakage or less. I would bet you could use a sheet gasket over a 2'x 4' spoil board and still be fine with that pump, as long as your blanks were nice and flat (which is difficult with solid wood blanks that size).

If you cut the whole sheet out and leave a .01 onionskin, then go back and cut a final pass, you could probably get away with just a pressure foot and no vacuum at all (just tack the blank in place with a composite nail in each corner).

If you do use an onionskin, I'd cut the first pass .005" wider, and then cut that last bit off with the onionskin. This will give a nicer finish.
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  #12  
Old 02-21-2017, 08:43 AM
benaroh benaroh is offline
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Ah thanks Russell, this is what I needed to hear! I'll probably stick with this larger pump, and hope it makes up for my lack of experience, haha.
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  #13  
Old 04-29-2017, 06:30 AM
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james mcgrew james mcgrew is offline
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  #14  
Old 05-01-2017, 12:01 PM
gbradley gbradley is offline
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Marc

I have experience with the Gast pumps. I run a similar pump(0523 1/4hp) like the one from the link posted in the thread. I have made a lot of fixtures to cut small parts in different gasket configurations. " No Onion Skin"
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