Wireless Set No. 52 Canadian - Project

[David Dunlop]

Another step closer to starting work on the Supply Unit.

These two cartridges of grease were picked up today, destined for the four bearings in the two rotary transformers. This grease follows the lineage of the original wartime grease used up until the 1970’s and discontinued by Imperial Oil shortly afterwards.

The original Andoc-C was a Grade 4, high temperature grease for electric motors. Imperial/Mobil no longer makes a Grade 4 grease, but their Polyrex line is still intended for this equipment today. Polyrex EM 103 is a Grade 3 grease but very hard to find in cartridges at a reasonable price. This Polyrex EM is a Grade 2 version rated to be stable up to 499 degrees which should be more than adequate for running the 52-Set on short term transmissions at standard room temperatures for the rest of its life. The tricky bit will be flushing out all the old sodium based original grease from the bearings before repacking them with this newer lithium based product.

I do not anticipate using very much of this grease, but the cost of two cartridges locally for pickup was well below the single cartridge price of this stuff I could find anywhere on the web. Leftovers will be transferred to the one pound tin and labeled, as part of the supplies for the 52-set shown in the Parts List.



David