I have a Delta-Rockwell 11" (#25-100) lathe and I'm looking for a
source for adapter sleeves for the L-00 spindle, which I believe has a
#4-1/2MT center hole. I'd like sleeves for #3MT and 5C collets as well
as a spindle nose protector. Anybody have any experience/advice re:
regrinding a #5MT to #4-1/2?
Yes, don't. According to Royal, the taper is actually a short 5MT.
Put prussian blue on your 5MT and check. I got a 5C adapter from
Royal that works well for mine (same model). The part number is
R184024. I made my own spindle nose protector and drawbar. See
and others in that series. My homemade adapter sleeve sucked, and was
replaced by the Royal unit. The rest is in service.
Thanks Pete! That Royal number matches the one on a closer that's
part of a complete lever unit currently offered on E-bay. I'll give
them a call for pricing. I'd already about decided to fab the nose
protector - there was one on E-bay (Clausing NOS) over Thanksgiving
but I lost the auction 8-(
WRT using a MT5/MT3 adapter sleeve, how short is "short"? According to
the specs on the Morse site the tapers are real close(MT5=.052626/in,
MT4.5=.052000/in) but the OD's barely overlap (MT5=1.74800/1.47500,
MT4.5=1.50000/1.26600). An MT5 sleeve is only going to fit 1/2" deep
in an MT4.5 socket if I did the math right. To get anywhere close to
the 4.625" socket depth of the MT4.5 you still need to reduce the MT5
OD by nearly .25". I don't see how a MT5/MT3 sleeve could be made
usable without regrinding the taper.
Pretty short. The front diameter was 1.575", with total taper length
of 2" according to the Royal tech IIRC. The problem with the MT5/MT3
adapter will be that the MT3 taper is probably in the larger diameter
section of the adapter. If you cut it off to fit, most of the MT3
will be gone. I suggested using prussian blue on your MT5 to verify
the taper. I know the Royal part fits, but only have their word on
To make a center for the headstock, I just turned one to fit using the
compound. It looks like a stubby end of a 5MT taper with a 1"
diameter center section sticking out. I used a 1" 5C collet to hold
the workpiece after turning the center 1" dia. portion, then turned
the tapered part and used prussian blue to check the fit and adjust
the taper. Two tries and I had uniform contact on the tapered
portion. It's certainly not as nice as a hardened and ground one, but
I can just true up the center after installing it each time. The
center part of it is still too long (at least for the lathe dogs I
have), but I'll cut it down when I want to turn something between
centers. Or, I may make a clamp style dog to match.
That is the case with the Clausing that I have, but there is no
certainty that other makers (e.g. Rockwell/Delta) use the same internal
taper on an L-00 spindle nose.
Nope -- I've turned a couple of adaptors from plain mild steel
from MT4-1/2 male to MT2 and MT3 female. I made the MT 4-1/2 part
first, and then made the female taper with the male part in my spindle.
[ ... ]
Good advice -- if you have a MT-5 already.
[ ... ]
If it is a short MT-5, it will be using the large end, not the
small end. The advice of using bluing will allow you to find out what
part of the MT-5 is actually being used.
If you discover that it is indeed only using the small end, then
it probably *is* a MT 4-1/2, and I would suggest buying one from
Clausing, if you don't have a taper turning attachment and the ability
to set it to match the internal taper of your lathe spindle, (Hint --
use an indicator on the back side of the taper, and set the taper
attachment to produce no change in reading as it is cranked in and out.
I don't know if you are still interested in the Rockwell taper spindle adapter for collet closers but I just tracked down a source.
The Royal number given in above posts is correct but Royal discontinued the production of this part and is out of stock.
There is a company in California that makes them and I just ordered one.
The name of the company is JFK Company and their phone number is (818)767-8573. It isn't cheap but they make these parts and will do it right.