RazMan
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| posted on 20/12/10 at 06:02 PM |
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Cutting an air filter backplate
I need to cut 12 x 35mm holes in the aluminium backplates for my air filters. As they need to be done very accurately, what are my options? I can
print a template and stick it to the ally to give an accurate guide, but I can't think of anything better than chain drilling and finishing off
with a file ....... 12 times!
What would you use?
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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cliftyhanger
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| posted on 20/12/10 at 06:04 PM |
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Q.Max Sheet Metal Punch Hole Punch - 35.0 mm on eBay (end time 04-Jan-11 19:59:43 GMT)
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Davey D
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| posted on 20/12/10 at 06:06 PM |
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with mine i used a top quality hole saw that was slightly smaller than what i needed, then used a half round file to perfect the shape.
If you have local engineering workshop with a laser cutting bed, then they would be able to cut exactly what you want first time without any need for
fettling
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907
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| posted on 20/12/10 at 07:49 PM |
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If it was me I would use a trepanning tool.
Careful if you "Google image" that as you will get pics of holes in peoples heads. 
Paul G
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dilley
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| posted on 20/12/10 at 08:46 PM |
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I have used decent hole saws, another idea is a wood bit! try it!
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Confused but excited.
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| posted on 20/12/10 at 09:01 PM |
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As clifty said; a Q Max cutter will give a perfect hole, time and time again. Not worth spoiling the job to save a few quid.
Tell them about the bent treacle edges!
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RazMan
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| posted on 21/12/10 at 12:20 AM |
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The trepanning tool looks a bit too scary for me but thanks for the tip Paul 
It looks like the punch is going to be the best way as long as I am careful with the measuring part. Ah well, it's only ally
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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907
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| posted on 21/12/10 at 07:56 AM |
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What you should have said Raz is:-
"I need a trepanning tool like I need a hole in the head."
Scan your eyes over the pic below and see if there's anything you'd like to borrow.
Cheers,
Paul G
 
hole cutting tool
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NS Dev
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| posted on 21/12/10 at 09:42 AM |
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On that subject.......is there any reason why I can't use Q-max punches in a flypress (obviously without the bolt! ) as long as I make a decent
holder?
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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RazMan
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| posted on 21/12/10 at 10:05 AM |
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quote:
Originally posted by 907
What you should have said Raz is:-
"I need a trepanning tool like I need a hole in the head."
Scan your eyes over the pic below and see if there's anything you'd like to borrow.
Cheers,
Paul G
hole cutting tool
Thanks for the offer Paul, but I decided to add to my slowly increasing toolkit and ordered a punch for a tenner - plus getting to your place in this
weather would cost more than that in food for the Huskies
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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907
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| posted on 21/12/10 at 10:20 AM |
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quote:
Thanks for the offer Paul, but I decided to add to my slowly increasing toolkit and ordered a punch for a tenner - plus getting to your place in this
weather would cost more than that in food for the Huskies
Surely you have to feed them anyway, or do they have to starve if you don't use them?
Cheers
Paul G
Nev.
Can't see a reason why not, other than a stop so that the two points on the male part don't bottom out and damage.
Also the centre has to be poked out of the female part of the die.
Cheers
Paul G
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