[4]

Measuring My Spindle Taper

[3]
[10] Like what you see?
Click here to donate to this forum and upgrade your account!

Gguerra

Swarf
Registered Member
Joined
Jan 1, 2017
Messages
4
Likes
0
#1
Ok
Newbie again......
As I mentioned earlier, I am in search of a 5c collet adapter for my Sheldon XL-56.
I noticed a few online, but I am faced with the question........what MT does my lathe spindle have? How do I measure that?
 

Jay-z

Active User
H-M Supporter-Premium Member
Joined
Jun 12, 2014
Messages
114
Likes
56
#2
Probably an MT 4.5
 

coffmajt

H-M Supporter - Sustaining Member
H-M Supporter - Sustaining Member
Joined
Sep 25, 2013
Messages
183
Likes
163
#3
one way would be to use a back plunger dial indicator with the deep reach pivot bar attached to reach into the spindle nose, then use another indicator to measure travel of the carriage while recording the taper in the spindle nose, then use those readings to compare to standard morse tapers shown in something like machinery handbook == Jack
 

Gguerra

Swarf
Registered Member
Joined
Jan 1, 2017
Messages
4
Likes
0
#4
Thank you for the info......
Being the genius that I am....(NOT).......
I looked in the ancient manual for the parts list and came up with this description...
I have a LOO spindle with a Morse 5 taper......does that sound right?
 

Jay-z

Active User
H-M Supporter-Premium Member
Joined
Jun 12, 2014
Messages
114
Likes
56
#5
I would almost guarantee that the taper is MT 4.5 . I own a machine with the same exact spindle and MT 5 will not fit .
 

4GSR

Iron
Former Member
Joined
Aug 8, 2011
Messages
0
Likes
16
#6
I would almost guarantee that the taper is MT 4.5 . I own a machine with the same exact spindle and MT 5 will not fit .
It's not a 4-1/2 MT. The Sheldon spindle taper is a tad bigger at the face of the spindle. On a Sheldon lathe the diameter at the face of the spindle is 1.625". A true 4-1/2 MT is 1.500" at the gage line on the large end. Big difference if you ask me. My collet adapter measures 1.634 dia. at .100 from the back of the flange on the adapter. When installed, the gap between the spindle and the flange of the adapter is about .250.

For reference, on most South Bend lathes, the taper diameter at the face of the spindle is 1.635".

On most Rockwell lathes, the taper diameter at the face of the spindle is 1.530". At least, that's what it measures on my 14" Rockwell lathe.

Ken
 

mzayd3

Active User
Non-Donating Member
Joined
Feb 10, 2014
Messages
364
Likes
163
#7
Ken is right. The Sheldon lathes have an MT5 spindle, but it is shortened. I'm not exactly sure what the dimensions are, but the slope and major? diameter match up with a MT5.


Sent from my iPhone using Tapatalk
 

4GSR

Iron
Former Member
Joined
Aug 8, 2011
Messages
0
Likes
16
#8
Ken is right. The Sheldon lathes have an MT5 spindle, but it is shortened. I'm not exactly sure what the dimensions are, but the slope and major? diameter match up with a MT5.


Sent from my iPhone using Tapatalk
Technically, its not a no. 5 MT. It's more like a Morse 4-3/4 taper if there was such a thing.

Ken
 

4GSR

Iron
Former Member
Joined
Aug 8, 2011
Messages
0
Likes
16
#9
Here is the drawing for the collet adapter for most Sheldon lathes that uses a 5C collet system. (Reference Sheldon Lathe Group on Yahoo)
 

Attachments

[6]
[5] [7]
Top