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Help with drilling a flat bottomed hole

Help with drilling a flat bottomed hole

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David Cambridge14/02/2017 14:33:01
252 forum posts
68 photos

I’ve a QCTP, and an aluminium bar that if I rest one end on the lathe bed is the correct length for the other end to be centre height. Then it’s just a case of lining up the end of the milling cutter flute with the end of the aluminium bar (bye eye - seemed to work well enough!)

David

JasonB14/02/2017 14:46:16
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25215 forum posts
3105 photos
1 articles

Just imagine that the other flutes are not there and set it as you would any HSS boring bar with the corner on ctr height.

You do neet to set the tool at a very slight angle with the blunt end a fraction further behind the lathe axis to stop the risk of rubbing and this equals out the slight conical end you get when plunging with a lilling cutter.

PaulR14/02/2017 15:12:28
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123 forum posts
21 photos
Posted by JasonB on 14/02/2017 14:46:16:

Just imagine that the other flutes are not there and set it as you would any HSS boring bar with the corner on ctr height.

You do neet to set the tool at a very slight angle with the blunt end a fraction further behind the lathe axis to stop the risk of rubbing and this equals out the slight conical end you get when plunging with a lilling cutter.

Thanks Jason, will give this a blast later!

Ian S C15/02/2017 11:41:51
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7468 forum posts
230 photos

Even better, you can use that cutter with all but one point knocked off. Never throw away old HSS tools, taps, end mills, center drills with the tip broken, they all make emergency lathe tools.

Ian S C

PaulR15/02/2017 13:05:10
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123 forum posts
21 photos
Posted by Ian S C on 15/02/2017 11:41:51:

Never throw away old HSS tools, taps, end mills, center drills with the tip broken, they all make emergency lathe tools.

Ian S C

No fear of that... I'm still trying to think of a use for a 10mm (carbon) die that snapped in two the other day but that one has got me beat so far (except maybe as packing).

Flying Fifer15/02/2017 13:15:37
180 forum posts

No fear of that... I'm still trying to think of a use for a 10mm (carbon) die that snapped in two the other day but that one has got me beat so far (except maybe as packing).

Or as a chaser , though you`d have to make some kind of holder.

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