driling through steel
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- earthwormjim
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driling through steel
Anyone got any tips on drilling through steel bar?
Bar is 4mm x 4mm.I would like to drill 10 x 2mm holes and then counersink the holes.I anticipate that the succesfull choice of a suitable drill bit will be the easiest route to a happy Jim.
Anyone have any experience in this field?
Many thanks.
This is for my 5th part built robot that I have started,called Raoul.
Bar is 4mm x 4mm.I would like to drill 10 x 2mm holes and then counersink the holes.I anticipate that the succesfull choice of a suitable drill bit will be the easiest route to a happy Jim.
Anyone have any experience in this field?
Many thanks.
This is for my 5th part built robot that I have started,called Raoul.
square or round? I would suggest punching a notch before you try and drill anything, much easier to correct than a wonky hole. then mild steel should be okay but maybe a bit of wd40 or thin oil as a coolant/cutting lubricant. should be okay with standard hss bits but nice cobalt ones never hurt! if you're using a pillar drill, or something you can vary the speed on, I'd say a slower rpm and feed rate else you just make a lot of heat and not much of a hole. If the drill is running too fast it can get so hot it fuses to the piece.
RPD International
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www.RPDintl.com
- earthwormjim
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- Marco Roberts
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- earthwormjim
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- earthwormjim
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for mild steel and HSS/cobalt bits. speed 20m/min
means
0.002*pi*Xrpm=20m/min
Xrpm=20/(0.002*pi-)=3185 rpm
Feed is 0.1mm/rev , meaning you'll drill trough the bar in 5 seconds.
Taking a tad longer won't hurt the drill tough.
But with such small drills, any deviation from the 90? drilling angle will result in a broken drill. Any side force will snap it.
Overfeeding will result in side forces.
And cobalt drills are more prone to snapping than Carbon steel or HSS steel bits.
means
0.002*pi*Xrpm=20m/min
Xrpm=20/(0.002*pi-)=3185 rpm
Feed is 0.1mm/rev , meaning you'll drill trough the bar in 5 seconds.
Taking a tad longer won't hurt the drill tough.
But with such small drills, any deviation from the 90? drilling angle will result in a broken drill. Any side force will snap it.
Overfeeding will result in side forces.
And cobalt drills are more prone to snapping than Carbon steel or HSS steel bits.
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I've been learning to drill steel better recently for the heavyweight. Basically slow and torquey has been best. I've not been using a pillar drill which has made things a little more difficult. I find doing a notch as Josh suggested, then starting with a tiny drill bit and working up has made things a fair bit easier too.
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- earthwormjim
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