Phil H
Posted a lot
Posts: 1,448
Club RR Member Number: 133
|
|
Jun 30, 2019 20:33:46 GMT
|
|
I’m doing a bit of port matching on some cast aluminium with a carbide burr in an electric (variable speed) die grinder bit it keeps getting clogged with aluminium. I’m not using any lubricant on it (should I? Haven’t in the past), is it the speed, material, the burr (I normally use a bullnose cutter but the pear shaped one works better with the access I have), or simply bad technique (operator error)?
The bits of ally come out with some digging about with a screwdriver but it’s slowing the job down somewhat!
|
| |
|
|
|
|
|
Jun 30, 2019 20:56:43 GMT
|
|
Try higher speeds.
|
| |
|
|
Darkspeed
Club Retro Rides Member
Posts: 4,876
Club RR Member Number: 39
|
|
Jun 30, 2019 21:25:18 GMT
|
Is in an ally cut carbide like this one  The only time I see carbides getting clogged is when folks use the wrong types. My main squeeze for alloy work  |
| |
Last Edit: Jun 30, 2019 21:30:53 GMT by Darkspeed
|
|
Rich
Club Retro Rides Member
Posts: 6,328 
Club RR Member Number: 160
|
|
Jun 30, 2019 21:35:37 GMT
|
|
You need lubricant on aluminium with most burrs. even WD40 works. Otherwise the burr will clog. Had the same issue 'machining' centre bores on alloys.
|
| |
|
|
Dez
Club Retro Rides Member
And I won't sit down. And I won't shut up. And most of all I will not grow up.
Posts: 11,790
Club RR Member Number: 34
|
|
Jun 30, 2019 22:59:24 GMT
|
|
Higher speed and lube. As rich says a bit of wd40 will help if nothing else. An electric die grinder might not be able to pull the same rpm as a conventional air powered one so might not be self clearing.
|
| |
|
|
Phil H
Posted a lot
Posts: 1,448
Club RR Member Number: 133
|
|
|
|
Cheers all! Sounds like I've got everything wrong - wrong bit, no lube and possible too low a speed..  I'm using a double cut tree profile (far right in this pic):  So sounds like the wrong bit. Lube - I've got some cutting fluid to will start using that. Speed - I only noticed it when I turned the speed down (not sure why I did) as it had been fine before - or I hadn't noticed it before.. It does 32,000rpm no load on Max (apparently) down to 8,000rpm at low (I had dropped it to about half speed so maybe 20,000rpm, so should go quick enough? Certainly seemed about the same speed as air-powered ones and despite being a bit chunkier, holds its speed better than my air one did. |
| |
|
|
Darkspeed
Club Retro Rides Member
Posts: 4,876
Club RR Member Number: 39
|
|
|
|
|
Even with some fluid those cutters will block as they are for ferrous - if not roughing out then 40 grit rolls are good for alloy.
|
| |
|
|
Phil H
Posted a lot
Posts: 1,448
Club RR Member Number: 133
|
|
|
|
|
This is effectively "roughing out" - getting rid of an (upto) 2mm step between the manifold adaptor and the throttle bodies..
Have ordered a proper Aluminium cutter now - thanks for the advice.
|
| |
|
|
