Abrasive "sticks" needed...
Discussion
Literally no idea where to put this, so I'll leave it here and trust in the mods to direct towards people who know...
I need a tapered abrasive stick, kind of like a fully round file, but with emery/wet and dry/sandpaper instead?
The idea is I have some holes to enlarge in some plastic parts, and the hole will need to be a fairly tight push fit on the new part that will be going in (a tweeter)
Normally I'd get a holesaw of the right size, but as there is a hole already there, I have no centre to line up to. What I have done previously is to enlarge the holes using a round, tapered whetstone, a little at a time until the holes were the right size, but I need to go almost up to 2" diameter, so the whetstone I have is too small
A file won't work, as it cuts in the fore-aft plane. It needs to be tapered along its length so I can push it in from behind, give it a twist and then check the fit.
Any ideas gratefully received! Thank you
I need a tapered abrasive stick, kind of like a fully round file, but with emery/wet and dry/sandpaper instead?
The idea is I have some holes to enlarge in some plastic parts, and the hole will need to be a fairly tight push fit on the new part that will be going in (a tweeter)
Normally I'd get a holesaw of the right size, but as there is a hole already there, I have no centre to line up to. What I have done previously is to enlarge the holes using a round, tapered whetstone, a little at a time until the holes were the right size, but I need to go almost up to 2" diameter, so the whetstone I have is too small
A file won't work, as it cuts in the fore-aft plane. It needs to be tapered along its length so I can push it in from behind, give it a twist and then check the fit.
Any ideas gratefully received! Thank you
Try "Permagrit" they're brilliant, I've used them for years in R.C. modeling and never worn one out, Not cheap mind.
http://www.permagrit.com/index.php?cPath=68
http://www.permagrit.com/index.php?cPath=68
Codswallop said:
I'd advise caution with one of these. I have one, and whilst I have used it on many occasions with great success, with delicate plastic you have to be VERY careful, because it has a tendency to 'draw' itself into the hole unless you're right on the ball.One false move and zzzzzzzip! You have a massive hole with the step drill bit hanging the other side of the hole in it's entirity, quietly laughing at you
Ray Luxury-Yacht said:
Codswallop said:
I'd advise caution with one of these. I have one, and whilst I have used it on many occasions with great success, with delicate plastic you have to be VERY careful, because it has a tendency to 'draw' itself into the hole unless you're right on the ball.One false move and zzzzzzzip! You have a massive hole with the step drill bit hanging the other side of the hole in it's entirity, quietly laughing at you
Google conecut, it's like the stepper drill above but without the steps, just go gently and you'll be fine unless the plastic is really flimsy. I use them on plastic (and steel) regularly.
Edited to add, if you buy a stepper drill avoid the erbauer spiral one from screwfix as its very aggressive when using. Better with a straight fluted one.
Edited to add, if you buy a stepper drill avoid the erbauer spiral one from screwfix as its very aggressive when using. Better with a straight fluted one.
Edited by 4Q on Sunday 16th October 08:04
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