Author Topic: Morse Taper  (Read 531 times)

Offline appletree

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Morse Taper
« on: December 28, 2018, 03:41:38 PM »
Hi Today I wanted to produce a spot face, I have loads of tooling, I pulled an 1 1/4 end mill out of the drawer (had it 40 years Tang and no draw bar) and popped it into the MT4 spindle of my mill (loads of slack) so reached for the MT3 to MT4 sleeve, (sticking out a mile)!
   
So the question, is there such a thing as a MT 3 1/2 morse taper?

Phil

Offline seadog

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Re: Morse Taper
« Reply #1 on: December 28, 2018, 04:14:36 PM »
Not that I've ever seen. There is the so called 4.5 used on Boxford and Harrison lathes.

Offline smiffy

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Re: Morse Taper
« Reply #2 on: December 28, 2018, 05:12:13 PM »
   Is it possible that it might be  Jarno or Brown & sharp taper https://www.engineersedge.com/manufacturing/jarno_taper_size_chart_13464.htm    Mike

Offline appletree

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Re: Morse Taper
« Reply #3 on: December 29, 2018, 08:39:54 AM »
Thanks for the replies, still stumped, looked up morse"s table and yes there is MT 4 1/2.
Looked at the Jarno but does not tally, Jarno 8 or 9 is the nearest.
The fat end of mine is @ 1.07 inch, Less than no 9 at 1.125 inch
The diameter is not down to 1.0 inch (Jarno 8 fat end) until half way along the taper.

So who knows, that is probably why it looks unused LOL

Phil

Online philf

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Re: Morse Taper
« Reply #4 on: December 29, 2018, 08:52:15 AM »
It sounds like a Brown & Sharpe number 9:
                  
Taper:#9
Large End: 1.0775
Small End: 0.9001
Length: 4.25
Taper/Foot: 0.5009
Taper/Inch: 0.0417
Angle From Center: 1.1955
Phil Fern
Location: Marple, Cheshire

Offline appletree

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Re: Morse Taper
« Reply #5 on: December 29, 2018, 08:55:17 AM »
Hi Again
Looks like I have sorted it, the fat end is 1.07 inch and the thin end 0.900 inches.
Not very scientific but looking where the taper starts and finishes (the taper is actually very shallow and is possible to make a realistic guestimation)
Given the centre section is marked Firth Speedicut as in Firth Brown, I think it is Brown and Sharpe taper no 9

Link to table https://en.wikipedia.org/wiki/Machine_taper#Brown_&_Sharpe

Phil