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PostPosted: Thu Oct 19, 2017 9:49 pm 
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Hi,

I need to drill few 30mm holes about 7mm distance from to each other in thin plywood.

I don't have access to a drill press.
How would you keep the drill straight and prevent it from moving?
How would you do a clean cut from both sides?
Are there any good drill guides for such task?


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PostPosted: Thu Oct 19, 2017 10:17 pm 
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30mm hole saw is the best way. https://www.orbitalfasteners.co.uk/en/p ... 2YQAvD_BwE

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PostPosted: Thu Oct 19, 2017 10:32 pm 
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C1REX wrote:
Hi,

I need to drill few 30mm holes about 7mm distance from to each other in thin plywood.



7mm remaining in between 30mm holes (in the 3mm ply which you proposed using in your other topic) is going to leave it very weak, (imo).

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PostPosted: Thu Oct 19, 2017 10:57 pm 
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ayjay wrote:
C1REX wrote:
Hi,

I need to drill few 30mm holes about 7mm distance from to each other in thin plywood.



7mm remaining in between 30mm holes (in the 3mm ply which you proposed using in your other topic) is going to leave it very weak, (imo).


It's super weak but there will be another plywood or polycarbonate.
Also when I put buttons in the drilled holes then it becomes as strong (or almost as strong) as before drilling.
I've tested it on a thin MDF. When I drilled holes even my baby son could break it but when I put buttons in it then my children couldn't break it.

Does anybody know if something like this works?Image


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PostPosted: Thu Oct 19, 2017 11:29 pm 
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aim for 6mm[5.5mm ] thick material
pile about 5 or 6 on top off each other and cut onto a scrap bit off material with the top sheet up side down
lube with ptfe spray lubricant

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PostPosted: Fri Oct 20, 2017 8:23 am 
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A drill press would be good , keeps everything nice and straight and can be left set up. Drilling through several layers would both speed things up and reduce the possibility of spelching through.
However , as you don't have access a drill press I'd advise the same approach as I answered before , a router and jig. Holes could be roughly drilled to remove most of the waste , a bundle of pieces place in the jig and the router run round to clean up the holes. A jig in this case is really little more than a sheet of ply or similar with a large circular hole against which the base of the router is run.


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