Hi, this is my first post so I guess is my introduction to the group. I love old heavy machinery especially waldown drills but this post is to ask your assistance with a problem I'm having with a Herbert B drill restoration. The B is a tiny high speed drill and mine is the 18000 rpm variant with a single phase motor and a albrect keyless chuck with a maximum opening of 3mm. This tiny capacity drill still weighs about 20kg and is an awesome bit of vintage engineering. I found some old posts on this forum about other restorations of this model which was why I joined.
So, to my problem. I'm an electrician by trade so have taken to bits more than my fair share of electric motors but I struggling to get the drive end armature bearing off this drills British made crompton parkinson motor. The bearing is trapped behind what I think is a one piece pulley adapter. I say I think because it is possible but I think unlikely that the ring that appears to be a spacer in front of the bearing is a separate part but a very close look at the joint suggests it is part of an adapter. I initially tried to pull the bearing and spacer off with a split plate bearing puller with no luck. It was then that I had a close look at the spacer and decided the adapter is one part. I had a close look around the spacer and can not see a taper pin that has been driven through the spacer and armature shaft and then polished smooth. My best guess is that it is screwed into the armature shaft but my best efforts with an 18 inch strap wrench after gripping the shaft between some ali jaws in a vice haven't got it to budge. The bolt in the end of the shaft is left hand and I have tried unscrewing the armature off the adapter in both direction but got nowhere.
There are only a few pictures on the web of this drill that detail the motor pulley but none of them are quite like this arrangement. This has a parallel 1/2 shaft for the pulley to fit over whereas the rest have a taper inside the pulley and the spare parts brochure which was linked in the other resto post on this site suggests that there is matching taper attachment that is fitted to the motor shaft. There is a picture on the web which shows this taper adapter attached with a small taper pin but that doesn't seem to be the case here.
I contacted Herbert at the spare parts email link which is on this forum but didn't get a reply.
Any of you fine folks got any wisdom to share?
cheers
Paul Henneberry Jarrahdale, Western Australia
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