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0.5mm hole drilling

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Paul Townsend22/12/2011 13:32:37
4 forum posts
I have a number of 0.5mm holes to drill in silver steel or mild steel and have had trouble with drills jamming and breaking on break through.
 
Any tips available?
David Littlewood22/12/2011 14:30:20
533 forum posts
Paul,
 
See the recent thread Here where it was discussed in detail.
 
You shouldn't normally (assuming a perpendicular hole) have too much trouble on break through with steel (worse on brass and other Cu alloys) but if so, put a thin steel backing sheet behind.
 
David

Edited By David Littlewood on 22/12/2011 14:32:53

alan frost22/12/2011 22:21:45
137 forum posts
3 photos
I would recommend the purchase of the Arc Eurotrade microdrill adaptor mit appropriate chuck. One of the bargains of the century if you look at what these things normally cost even from good value suppliers like J and L. No connection with any of them (or even with reality)-just a happy customer of both..
Paul Townsend23/12/2011 07:23:18
4 forum posts
Ta for responses.
The holes are for pinning loco driver wheels to 1/8" axles in 4mm scale and are at 45degrees.
I have a jig which helps file an angled flat on the axle end (machined off after drilling) so the drill starts perpendicular to the surface, hence progresses easily with my high speed drill press, the axle is clamped in the 45degree jig. The breakthrough is then at 45 degrees in the round surface and that is where breakage is high. I am wondering if some sort of sleeve slipped on the axle while drilling would help. If so what material is recommended?
A friend has recommended using an archimedes drill instead of HS machine.
I will try the Arc adaptor.
JasonB23/12/2011 09:02:54
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25215 forum posts
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Yes I'd make a sleeve or "U" shaped block of the same material to run the drill into so in effect it never breaks out into air or a softer material.
 
J
David Littlewood24/12/2011 13:36:05
533 forum posts
To drill a hole in an angled surface, it can be quite useful to start it with a slot drill. For this use you can get away with using a drill chuck as there is little sideways pressure. This is also useful for starting holes in lost wax brass castings with uneven finishes.
 
I suppose you could minimise problems on breakout by continuing all the way through, though most times the slot drill would not be long enough.
 
David

Edited By David Littlewood on 24/12/2011 13:36:58

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