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Old 01-07-2020, 04:29 PM
Duraloy Technologies Duraloy Technologies is offline
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Question Holding down work piece with phenolic table top

Hi all,

We recently purchased a cobra elite (12HP) to make wood patterns for our sand castings. We opted for the phenolic table without the vacuum system. Originally we planned on tapping holes into the phenolic table top and clamping down the workpiece using nylon bolts and a simple clamp. Will I be able to use the cobra elite to surface and drill holes in the phenolic top? If so, would I need specific bits and endmills?

It seems that a common solution is adding an MDF spoilboard but for our application it doesn't seem necessary because all of or patterns have about 3/4 in of material below where we would be actually cutting. So basically the bottom of the pattern would be acting as the spoilboard.


-Stephen
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Old 01-07-2020, 08:28 PM
kevin r kevin r is offline
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Stephen
Your cobra is more than capable of drilling the required holes and doing any surfacing you may need. We use a cobra to drill the mounting holes and cut the tops to size at the factory.
As for tooling, you can either use the appropriate size drill bit or a small bit and drill your holes that way. We use oflutes and straight cut end mills to do the holes and surfacing.
Others will probably come along with other ideas and solutions.
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Old 01-07-2020, 11:12 PM
The real JP The real JP is offline
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you could use vacuum fixtures. Two sided ones that stick to the work and the table if that fits your needs.
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  #4  
Old 01-08-2020, 09:44 AM
Duraloy Technologies Duraloy Technologies is offline
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Quote:
Originally Posted by kevin r View Post
Stephen
Your cobra is more than capable of drilling the required holes and doing any surfacing you may need. We use a cobra to drill the mounting holes and cut the tops to size at the factory.
As for tooling, you can either use the appropriate size drill bit or a small bit and drill your holes that way. We use oflutes and straight cut end mills to do the holes and surfacing.
Others will probably come along with other ideas and solutions.
I saw a post on this forum a while back that mentioned that we should not drill all the way through the phenolic top. I'm assuming it's so that we don't hit the frame, but if we avoid that, are there any downsides to drilling through?

-Stephen
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Old 01-08-2020, 10:03 AM
guitarwes guitarwes is offline
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You could always rout channels and install a T-track system into your phenolic top to hold down various sizes of material.
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  #6  
Old 01-08-2020, 08:09 PM
rcrawford rcrawford is offline
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Quote:
Originally Posted by guitarwes View Post
You could always rout channels and install a T-track system into your phenolic top to hold down various sizes of material.
If you design it properly, you can use shorter 2' T-track sections that fit entirely within each vac zone, so when you through a spoilboard on top you can still use each vacuum zone separately. If you leave a little gap above the T-track, the vacuum can still pass over it and so it shouldn't affect your vacuum plenum much at all.
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