Gallery, Projects and General > How do I??

How do I measure a spindle taper?

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mattinker:
i made Morse 3 and 4 adaptors for my colchester master using five to three morse adapters the Colchester has a 4 1/2 morse taper! I think a morse 6 to 3 adapter would be a good start! My project is long term, I have made the plugs in order to make the ER 40 and 32 chucks, two advantages, over the morse three Er 32 etc It's not too difficult to make the ER tapers (16° I think) The other advantage is making a through collet holder with a tubular draw bar allows longer stock to be held. The ER40 range usually goes up to 26mm, but up to 30mm collets are available!

Cheers, Matthew

Jo:
It might help if we know what the Lathe is... Colchesters have their own tapers that are just bigger than a 5MT and have adapters to take them down to 3MT. Have you checked if it mentions the taper on Tony's site?

An ER32 collet holder up the nose of a lathe that size  :scratch:

Jo

Anzaniste:
Measuring a taper bore can be done with two ball bearings. A big 'un that will just fit in the larger end of the taper and a little 'un that fits the small end. Put the little one in place and measure with a depth micrometer or similar the distance down the hole using a suitable reference point. Do the same with the large ball. Knowing the ball diameters and their separation a bit of geometry calculates the angle.
I can't explain the geometry in simple words but somewhere in my notes I have a nice diagram if only I could find it. :doh:

I will look.


Here we go I just googled it:-  http://mathscinotes.com/2014/09/taper-measurement-using-gage-balls/

PekkaNF:
I have quick and dirty method: to measure the angle, but you still have to connect the dots.

Pat playdough halfway (centre height), you only need two ridges.....then take two utility knife snap-off blades and gingerelly pres sharp parts snugly inside the taper, sharp part out. Then use our favorite zap (or epoxy glue) between the blades and after the has has set, pull out the "wedge". Now that is brittle and usless for measurement, but set it on something flat and put good dollops of glue to glue it down on each end of the blades and then you can measure it. Not accurate enough to make replacement, but good enough to identify taper.

Pekka

mattinker:

--- Quote from: Jo on September 14, 2017, 03:41:18 AM ---It might help if we know what the Lathe is... Colchesters have their own tapers that are just bigger than a 5MT and have adapters to take them down to 3MT. Have you checked if it mentions the taper on Tony's site?

An ER32 collet holder up the nose of a lathe that size  :scratch:

Jo

--- End quote ---
I'll answer for adev, as i have the same Edgwick mki that he has. It's a proprietary spindle nose taper. the spindle bore is 1 3/4 inches so we are over Morse 5. I think Er32 and 40 could be very useful on this lathe especially as it a 1940's modle, so chucks are pretty worn out!!

Regards, Matthew

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