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This Crompton Parkinson motor came from a Myford ML7 and was stored in poor damp conditions. I have taken it apart and cleaned everything up, reassembled it after converting windings to Delta.
The motor was then left for a week in an electric oven at 70 centigrade, to make sure the windings were dry. Lubrication was dealt with and it rotated smoothly.On turning it on, I was rewarded with a very quiet motor. I then reversed it and there was a high speed knocking. which disappeared when .forward was selected.
The bearings are simple sleeve bearings and although not immaculate they should be good. I have seen and used sleeve bearing motors whose sleeves were more worn than this specimen and they were pretty silent. The rotor shafts were in reasonable condition, some light scoring but otherwise good.
I have just started renovating this drill. It isn t the common high speed bench drill that one normally finds, if you google the above title. I believe that this one is an earlier model, probably pre war or wartime manufacture. The main spindle is supported on a vertical sliding surface and fastened there while the quill can be used in the normal manner via an adjustable lever. The setup is very similar to the much more common Pollard drills
Now the problem is this. It has a notice listing its speeds. It has 6 speeds ranging from 2350 rpm to 12,000 rpm. Lifting the belt cover reveals a block of 3 flat pulleys on the motor with equivalent pulleys on the main spindle, there is a very thin, wide belt transmitting the power. It still has its original massive motor which is a 1/3 hp, 2880 rpm three phase. The motor is specific to this drill and a massive mounting arm is integral with one of the motors end covers.
Would this improve the quality of signal to a CNC machine? model-engineer.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from model-engineer.co.uk Daily Mail and Mail on Sunday newspapers.
Posted by Ron Laden on 03/02/2021 06:58:37:
I don t even buy Loctite by brand name now I buy the cheaper versions at less than half the price..
I know what you mean, and I understand Duncan s comment about not all Chinese stuff being bad, but for me, the difference in cost between Loctite and others isn t worth the risk. For the amount I use I d rather avoid the just buy the right stuff and this wouldn t have happened type comments! .
Just my opinion!
.
I apply a bit of engineering logic to the problem: how good does the glue need to be for the purpose I have in mind? For me, the answer is usually not very in which case I don t waste money on excessively good products.