80 mm or 3" Self centering chuck. For this post I will use metric in all measurements.
Firstly I have had good success with the Sanou chucks.?
Excellent quality and prices that suit my budget. I have the 125 mm model as well and will?
post shortly my way of mounting it to my 100 mm dia mini lathe spindle.
It?s not normal a 80 mm dia chuck is considered as a must have, as most mini lathe owners
have opted to purchase lathes already with 100 mm dia chucks or have procured an adapter plate
to convert and mount to a 80 mm dia mini lathe spindle.
My original mandate was to be able to mount a chuck to my electronic milling indexer.
Rotation or we could say 4th axis is achieved by a Arduino based control box designed Richard UK?
or I program, write a G code and use my 4 th axis CNC DDCS V 2 controller.
Both systems drive a timing belt with pulleys a 6:1 ratio, using a Nema 23 stepper attached to the side of the tooling plate.
The indexer center-line height from the mill table is 50 mm, making the use of a 100 mm impractical.
The indexer that I built has a main spindle (a converted mini lathe tailstock quill) with a #2 morse taper.
So I modified a # 2 MT stub arbor ex Arc Euro Trade and set to to make an adapter plate to link
the stub arbor to the inner face of the 80 mm dia chuck.
Photo 1 shows the finished work, photo 2 shows the adapter plate register lip being skimmed.
This lip is 1.6 mm dia than the 80 mm dia register. This allows with the use of 4 x set screws?
to "float" the chuck enabling with the use of a DTI or DI to dial in concentricity of a part being held?
in the external/internal hard jaws as supplied by Sanou.
After that I decided to make an adapter plate that would allow direct mounting to my 100 mm dia lathe spindle.
Again most people are rushing to go the opposite direction, converting lathes with a 80 mm dia chuck to 100 mm dia chuck.
This time the locating back spigot of the 80 mm dia chuck was a tight fit on the adapter plate and this plate is allowed to
"float" off the major dia of the 100 mm dia lathe spindle.
The fixing bolts are necked down to allow clearance of the lathe spindle chuck mounting holes.
photo 3 shows a final clean up on the late after drilling the fixing holes, photo 4 finished assembly,?
photo 5? shows mounted to the mini lathe.
Photo 6 is the 80 mm dia chuck with the master soft jaws fitted.
These masters will accept the soft jaws that I use for my 100 mm dia and 125 mm dia chucks.
The scrolls in these master jaws were cut by CNC .
Photos 7 , 8 showing the indexer and control box. This is using a #2 MT ER 32 holder , I do not have available
currently photos of the 80 mm chuck fitted to the indexer. But the same principle applies, a #2 MT male into the # 2 MT female indexer
spindle held in with a draw bar.
Hope of interest.
Please feel free to ask questions on any of the above post , be it chucks, adapters, step indexers or CNC control.
--
John
John Lindo
