The Craftmans Shop > New from Old
The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
awemawson:
What a gentleman :thumbup:
vtsteam:
Good man, Pete! :beer:
awemawson:
So with the mention of possible unresolved gear changing problems when still at the University (it HAS gears - news to me :scratch:) time to see what this beast has by way of transmission.
Main DC DRIVE motor by Mawdsleys 26.5 kW / 5000 RPM with attached blower motor. Drive goes (I assume, not dismantled yet) by drive belt in a big cover to the co-axial gear box by Andantex. This gear box has a lump bolted on the side with a Parvalux style 90 degree motor that I assume moves the gear box from one ratio to the other.
The gearbox label is not very clear where the ratio has been stamped, but I am reading that as "1 & 3.2" which seems sensible - straight through = 1, and via presumably a planetary system giving the 3.2
It seems that Andantex are still in business however nothing is showing up for this particular gear box. Looking at the 'type' box where it is stamped "BVR 353" implies it's a special for Beaver, but probably a variant of a standard one - possibly the gear change arrangement was customised.
Looking at note that I have for commissioning a later TC-20 lathe there would seem to be two 'M Codes' involved 'M41 - Low Gear Request' and 'M42 - High Gear Request'
I would suspect that if there is a gear changing problem it most likely is with the Parvalux motor and it's electrical drive system so long as the main box hasn't been mangled by changing gear 'on the fly', and the ladder logic in the controller should prevent this (hence 'Low Gear REQUEST' rather than 'Low Gear')
. . . again time only will tell.
What I can't find at the moment is the spindle encoder - this lathe has a 'C' axis whereby the spindle can be orientated anywhere in the 360 degrees of rotation for operations using 'live / driven tooling' in the tool turret
I am negotiating with someone who claims to have all the wiring diagrams for this vintage of TC-20, and I'm loath to replace the controller and power up things like the main drive and gear change system until I've given the drawings a meticulous inspection. He's been on holiday returning Monday so hopefully . . . .
awemawson:
Well I found the spindle encoder ! It was hiding behind the tin work that protects the hydraulic chuck open / closer.
awemawson:
A bit more data mining, and I think I've found the Gearbox that the Beaver one is a modification of. It's the MSD-size 353 in the attached screen grabs of their catalogue.
Visually it's the same, the dimensions tally, but the ratio is different as mine is 1:3.2 whereas the standard is either 1:1.38 or 1:4.94 and the gear changing arrangement is different.
Now the model size is '353' and the data plate quotes 'BVR 353' - so a few customised tweaks for Beaver I think :clap:
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