ballen
Diamond
- Joined
- Sep 25, 2011
- Location
- Garbsen, Germany
I am making a new barrel to fix up a spare tailstock for my cylindrical grinder. I'm almost at the last step, which is to cut a straight module 1 rack of 18 teeth.
I was setting this up on my FP2, with a gear cutter mounted on a 22mm horizontal arbor. Normally I have a long-reach head mounted on my FP2, and use that as the horizontal overarm (it comes with a bearing holder that mounts underneath). But for this particular operation there is not enough clearance under the bearing holder. So I decided to try the regular overarm, since its bearing holder has more clearance. This overarm and bearing have been sitting in my tooling cabinet for the past half-decade since I got the mill, just waiting to be used by me for the first time.
Big surprise: they don't fit! The bronze bearing bushing is several mm too high. Here is what happens if I slide the bearing bushing onto the arbor: you can see that the bearing holder won't slide onto the overarm.
The arbor is not bent. The overarm is not canted. It's just very very far off. Here's another photo to demonstrate. I have removed the 22mm arbor and put a 16mm ground pin into a 16mm collet:
It's easy enough to fix, I just need to plug the hole and bore a new hole for the bushing. I pressed out the bushing to get some idea of how far off this is:
But looking at this, I realised that something must really be wacky here. The bearing and the overarm are both stamped with the same 4 digit number. But are they from an FP1 or some other Deckel machine, and just don't fit the FP2? In that case perhaps I should swap them for the correct parts rather than modifying them to fit.
Cheers,
Bruce
I was setting this up on my FP2, with a gear cutter mounted on a 22mm horizontal arbor. Normally I have a long-reach head mounted on my FP2, and use that as the horizontal overarm (it comes with a bearing holder that mounts underneath). But for this particular operation there is not enough clearance under the bearing holder. So I decided to try the regular overarm, since its bearing holder has more clearance. This overarm and bearing have been sitting in my tooling cabinet for the past half-decade since I got the mill, just waiting to be used by me for the first time.
Big surprise: they don't fit! The bronze bearing bushing is several mm too high. Here is what happens if I slide the bearing bushing onto the arbor: you can see that the bearing holder won't slide onto the overarm.
The arbor is not bent. The overarm is not canted. It's just very very far off. Here's another photo to demonstrate. I have removed the 22mm arbor and put a 16mm ground pin into a 16mm collet:
It's easy enough to fix, I just need to plug the hole and bore a new hole for the bushing. I pressed out the bushing to get some idea of how far off this is:
But looking at this, I realised that something must really be wacky here. The bearing and the overarm are both stamped with the same 4 digit number. But are they from an FP1 or some other Deckel machine, and just don't fit the FP2? In that case perhaps I should swap them for the correct parts rather than modifying them to fit.
Cheers,
Bruce
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