Parallel Flute Reamers on Morse Taper Shank – How do I work out the size?

This topic has 9 replies, 7 voices, and was last updated 12 November 2016 at 16:11 by Michael Gilligan.

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4 October 2016 at 18:03 #259204
Steve Withnell
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@stevewithnell34426
I was offered 5 of these reamers brand new in box. Although all the labelling was intact, there was no obvious sizing info. The only marking that I thought might be size related, on the box and the reamer was '3A-352'. Roughly 8mm on a MT2 shank.

The manufacturer appears to be 'Bridge'.

Any clues?

Steve
Advert

4 October 2016 at 18:03 #8316
Steve Withnell
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@stevewithnell34426
4 October 2016 at 18:37 #259207
Michael Gilligan
Participant
@michaelgilligan61133
Steve,

You could try asking these guys: **LINK**

http://www.taylorandjones.co.uk/wp-content/uploads/2014/03/13.pdf

MichaelG.
5 October 2016 at 20:12 #259399
Steve Withnell
Participant
@stevewithnell34426
Thanks MIchael.

Steve
5 October 2016 at 20:42 #259404
Tony Pratt 1
Participant
@tonypratt1
Am I missing something, can't you measure them?

Tony
12 November 2016 at 14:35 #266180
Ken Price 1
Participant
@kenprice1
Usually with reamers, their size is stamped at the base of the reamer just above the end of the taper. However I have had reamers with no specific markings and these I found to made for the aircraft industry where very specific sizes are required not being standard metric or imperial sizes. I have undertaken subcontract work for this industry and frequently had to use such items.

Ken Price
12 November 2016 at 15:07 #266191
Neil Wyatt
Moderator
@neilwyatt
Posted by Tony Pratt 1 on 05/10/2016 20:42:50:

Am I missing something, can't you measure them?

Tony

Not if they have an odd number of flutes, and they often have 7 or 5, I think it reduces chatter if they are an odd number and not perfectly evenly spaced.

Neil
12 November 2016 at 15:47 #266199
NIALL HORN
Participant
@niallhorn50878
Ideally, you need to find someone with a v-anvil micrometer. The angle of the V needs to be correct for the number of flutes – 60 degrees for 3 flutes, 108 degrees for 5 flutes and 128 degrees 34 minutes for 7 flutes. They are not cheap! An ordinary mike will not give a correct diameter.

V-angle mics are also used to detect lobing on centreles-ground spindles.
12 November 2016 at 16:03 #266201
mark smith 20
Participant
@marksmith20
why dont you just drill a slightly undersized hole in something like 1/2" aluminium, put the reamer through and measure the hole size???

Or 352/1000" =8.94mm (but may be totally wrong)

Edited By mark smith 20 on 12/11/2016 16:06:43
12 November 2016 at 16:11 #266202
Michael Gilligan
Participant
@michaelgilligan61133
Posted by Steve Withnell on 04/10/2016 18:03:11:

I was offered 5 of these reamers brand new in box.

.

Mark,

I suspect that the reason for not adopting your very practical approach is evident from Steve's introductory comment.

MichaelG.
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