Drill size form19mm reaming.

Drill size form19mm reaming.

This topic has 6 replies, 4 voices, and was last updated 6 March 2015 at 02:05 by Ian S C.

Viewing 7 posts - 1 through 7 (of 7 total)

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4 March 2015 at 23:04 #7503
Chris Denton
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@chrisdenton53037
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4 March 2015 at 23:04 #182171
Chris Denton
Participant
@chrisdenton53037
Not too good with reamers.

What size final drill should I use before reaming 19mm stainless 303?

Thanks.
5 March 2015 at 05:47 #182182
Hopper
Participant
@hopper
0.25mm under should do you. ie 18.75 or so. Providing you drill pilot hole first and then open the hole out to 18 or so.

For best results, regards location and concentricity, it is best to drill to say 18.00 then bore to 18.75 to 18.90 or so and then ream the final gnat's whisker. The boring bar removes any out of round and wandering resulting from drilling.

Trick with stainless is to keep the cutting speed lowish but keep the feed up to the job. Letting the tool/drill rub on the stainless will quickly work-harden it and make it a regular PITA to deal with.
5 March 2015 at 06:49 #182185
Boiler Bri
Participant
@boilerbri
I would be tempted to leave more for the reamer to cut, say .5mm to prevent rubbing with stainless steel for once the surface has hardened you will struggle to get under the hardened surface.

Low speed and plenty of cutting fluid with a reasonable feed rate.

Bri
5 March 2015 at 08:22 #182192
Ian S C
Participant
@iansc
And when drilling the initial hole, drill say 10 mm, then 18 mm or maybe 18.25 mm.

Ian S C
5 March 2015 at 10:52 #182212
Chris Denton
Participant
@chrisdenton53037
Thanks.

It's 303 so shouldn't work harden.
6 March 2015 at 02:05 #182290
Ian S C
Participant
@iansc
It still doesn't like very small skims with a clearing drill.

Ian S C
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