triumph406
Diamond
- Joined
- Sep 14, 2008
- Location
- ca
I changed the belleville washers a while ago, 1 washer was broken, and maybe 8-10 were split. That gave me a drawbar tension of 900#
After changing the washers I measured a drawbar tension of 1200#.
According to a FADAL source the locking drawbar tension should be 1650#-2000#. I haven't seen this in any FADAL documentation, but I consider the source reliable (FADAL family member)
I called ITS who I got the washers from and asked if there was anything I was missing, changing to new bellevilles gave me 1200# (up from 900#) Was there a reason I wasn't getting in the range of 1650#-2000#? ITS had somebody in the FADAL spindle realm call me, and there is a method of increasing the drawbar tension.
To increase the drawbar tension requires .007" shims under the split retainers in the locking assembly.
Typically it might require (2) .007" shims, 2 didn't make any difference to mine. 5 shims bought the drawbar tension to 1700#, but it had a very distinct "thwack" when it was retaining a tool when I was manually loading the tool into the spindle.
I have 44 bellevilles installed, I added another belleville (for 45 total) and removed a .007" shim leaving 4 shims underneath the split retainer.This removed the "thwack" when the tool was being retained by the drawbar. That gave me a drawbar tension of 2000# Tool changes are smooth when using the ATC.
Hope this helps because as far as I can tell the procedure isn't in any manual, and I haven't seen it on line.
The shims are HDW-1204 and are availible from ITS. I made some from Mcmaster 98126A377, which I put on a mandrel and turned down the OD.
After changing the washers I measured a drawbar tension of 1200#.
According to a FADAL source the locking drawbar tension should be 1650#-2000#. I haven't seen this in any FADAL documentation, but I consider the source reliable (FADAL family member)
I called ITS who I got the washers from and asked if there was anything I was missing, changing to new bellevilles gave me 1200# (up from 900#) Was there a reason I wasn't getting in the range of 1650#-2000#? ITS had somebody in the FADAL spindle realm call me, and there is a method of increasing the drawbar tension.
To increase the drawbar tension requires .007" shims under the split retainers in the locking assembly.
Typically it might require (2) .007" shims, 2 didn't make any difference to mine. 5 shims bought the drawbar tension to 1700#, but it had a very distinct "thwack" when it was retaining a tool when I was manually loading the tool into the spindle.
I have 44 bellevilles installed, I added another belleville (for 45 total) and removed a .007" shim leaving 4 shims underneath the split retainer.This removed the "thwack" when the tool was being retained by the drawbar. That gave me a drawbar tension of 2000# Tool changes are smooth when using the ATC.
Hope this helps because as far as I can tell the procedure isn't in any manual, and I haven't seen it on line.
The shims are HDW-1204 and are availible from ITS. I made some from Mcmaster 98126A377, which I put on a mandrel and turned down the OD.