caber
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| posted on 10/11/06 at 09:38 PM |
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Step Drill Speed
I just bought one of these and was wondering what the best speed was to get a good finish on steel sheet, do you run these fast or slow?
TIA Caber
 
Rescued attachment 698459.jpg
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Mark Allanson
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| posted on 10/11/06 at 09:48 PM |
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Really slow, cutting oil in moderation or it will burn
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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caber
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| posted on 11/11/06 at 12:14 AM |
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Mark,
Thanks
Caber
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zetec7
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| posted on 11/11/06 at 01:32 AM |
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Glad you asked that - not because I knew the answer, but because I needed to know as well. I bought a set of those things, and haven't tried
'em out yet. Probably would have fried one before finding out myself...
http://www.freewebs.com/zetec7/
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02GF74
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| posted on 15/11/06 at 09:34 AM |
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if you bought one from screwfix, throw it in the bin now; you'd be lucky to do two 20 mm holes in 2 mm steel.
No need to ask how I found that out - in the end bought one made in UK, Sheffield(yes, some things are still made in UK) for > £ 20 and has done 10
times the holes and still going string.
(i.e. if you have paid less than £ 20, expect SF kwalitee).
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NS Dev
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| posted on 15/11/06 at 12:49 PM |
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yep, as usual you get what you pay for, and a bit of support for things made properly in this country never goes amiss!!
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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owelly
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| posted on 15/11/06 at 08:37 PM |
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If my memory serves me correct, the cutting speed for mild steel is around 24m/minute.
So a 10mm hole would want a speed of 776rpm.
13mm hole would like 597rpm.
I would use the slower of the calculated figures if you are using a cone cutter. If the largest size you are making is 13mm, then use the 13mm cutting
speed. I hope this makes sense?
http://www.ppcmag.co.uk
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caber
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| posted on 16/11/06 at 08:27 AM |
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Thanks for the responses, Owelly that is very useful! I managed to get the holes cut cleanly with a power drill on lowest speed!
Caber
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02GF74
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| posted on 16/11/06 at 12:34 PM |
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quote:
Originally posted by caber
Thanks for the responses, Owelly that is very useful! I managed to get the holes cut cleanly with a power drill on lowest speed!
Caber
I've had to make big holes in 2-3 mm steel and did it using a cordless drill, slow speed.
That was too fast so I pulsed the trigger, ptress on/off so the average speed is much sloer - did the job.
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