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Tool MT 3 - ER40 Collet Chuck

Tool
J

jorogi

Ultra Member
A few weeks back I believe it was Kelly posted,

5" 1 1/2 - 8 TPI backing plate with lock collar​

The post discussed the possibilities of using it to make a collet chuck holder for a SB 9 like mine, and I think JustaDB mentioned one from Accusize that had a MT3 mount. To him the down side was the need for a drawbar but to me that's not really an issue.
So I ordered one and landed it on the door step for $90. It appears well made and nicely finished. I made a quick and dirty drawbar, chucked up an end mill and measured a couple of 10ths runout without any cleaning or clocking. Quite happy.

accusizetools.com

MT2/3/4 Morse Taper Shank to ER32/40 Collet Chucks, Max RPM 8,000

The Accusize Morse Taper 3 Shank ER Collet Chuck is commonly used as the following tools (and solutions): Morse Taper 3 Shank ER Collet Chuck, etc.
accusizetools.com accusizetools.com
 
Now that you have that, you can take all the measurements and make your own that allows you to pass material through the headstock. I took all of the pertinent information from the er chuck and spindle nose and came up with this.
20210315_194407.jpg
 
That was my original plan but I can't cut metric, yet, and standard ER nuts are metric. Also the spindle on the SB is pretty small anyway so this should be good for small parts. When I get the Colchester going I'll rig up a pass through for it.
 
jorogi said:
That was my original plan but I can't cut metric, yet, and standard ER nuts are metric. Also the spindle on the SB is pretty small anyway so this should be good for small parts. When I get the Colchester going I'll rig up a pass through for it.
Click to expand...
I made a thread on ER32 chuck for my old imperial southbend. I played a mix and match game with the gears and got within about 1% of the metric threads. Works great.
Gary
 
Garyt said:
I made a thread on ER32 chuck for my old imperial southbend. I played a mix and match game with the gears and got within about 1% of the metric threads. Works great.
Gary
Click to expand...
I got off lucky, I bought a bunch of South Bend parts and a complete set of transposing gears and a metric thread dial were included. The thread dial however I believe is for s metric leadscrew, which I also have and the gear box..... I don't think the transposing gears had ever been used.....
 
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