johnH20
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| posted on 23/3/17 at 06:30 PM |
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Advice from machinists please
I need to make 4 x 40 mm holes in a sheet of 8 mm ali plate for an inlet manifold. I have drill press but my biggest step drill 30 mm - don't
know if that would be up to the job anyway. Would some kind of hole saw work , if so what type? Any advice welcome.
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leon51274
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| posted on 23/3/17 at 06:50 PM |
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A decent metal cutting hole saw, plenty of cutting compound and slow the speed of the drill down should give you as good a job as any, other than
laser or waterjet.
Oh and a good centre-pop mark so the drill bit doesn't wander on start up.
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tegwin
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| posted on 23/3/17 at 07:34 PM |
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I have used 40-70mm hole saws in 8mm steel plate without too much issue just go slow, keep it cool and clamp the thing down tighter than a tight
thing!
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rusty nuts
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| posted on 23/3/17 at 07:42 PM |
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I made my inlet manifold from 12mm ally ,I used a woodworking coping saw to cut it out including the ports which I cut slightly undersized then
blended into the ports.
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40inches
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| posted on 23/3/17 at 07:45 PM |
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Replace the drill in hole saws with a length of steel rod, and drill the pilot hole separately.
This stops the drill flutes enlarging the pilot hole 
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gremlin1234
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| posted on 23/3/17 at 07:46 PM |
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this one says its suitable for steel and ali so should be fine, but for ali you may need to take it slowly
http://www.screwfix.com/p/makita-plumbers-holesaw-kit-6-piece-set/4689r
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theprisioner
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| posted on 23/3/17 at 08:54 PM |
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Mag or Annular hole cutters are better than hole saws way more accurate. Needs a good drill press with low speeds.
http://sylvabuild.blogspot.com/
http://austin7special.blogspot.co.uk/
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nick205
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| posted on 24/3/17 at 08:54 AM |
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quote:
Originally posted by tegwin
I have used 40-70mm hole saws in 8mm steel plate without too much issue just go slow, keep it cool and clamp the thing down tighter than a tight
thing!
As said, slow speed and hold the work piece very well. If it picks up and spins it'll hurt!
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johnH20
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| posted on 24/3/17 at 07:36 PM |
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Thanks chaps, plenty of good advice there.
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AJC
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| posted on 25/3/17 at 08:44 AM |
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I can get them machined for you if its not too urgent.
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johnH20
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| posted on 25/3/17 at 05:26 PM |
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Thanks for the offer AJC. I am still at the design stage. Also trying to get my runners to fit using standard bends. Very difficult installation.
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AJC
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| posted on 25/3/17 at 06:57 PM |
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Sounds complicated! If I can help send me an email.
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