HOBBYMAT MD65 – JAMMED

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HOBBYMAT MD65 – JAMMED

This topic has 8 replies, 4 voices, and was last updated 3 April 2025 at 14:25 by David ANDREWS 2.

Viewing 9 posts - 1 through 9 (of 9 total)

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27 March 2025 at 14:12 #790779
David ANDREWS 2
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@davidandrews2
Owing to a stupid error, this very occasional and elderly “turner” has jammed his venerable second-hand Hobbymat MD65 in the furthest position from the live end while familiarising himself with the machine again after a “lay-off.” Can anyone provide some advice on how to rectify the situation? I would be most grateful.
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27 March 2025 at 16:12 #790794
John Haine
Participant
@johnhaine32865
Do you mean the carriage won’t move?
27 March 2025 at 16:45 #790799
David ANDREWS 2
Participant
@davidandrews2
Thanks for acknowledging, John. In a word, yes.
27 March 2025 at 16:47 #790800
Bazyle
Participant
@bazyle
Loosen the 3 hex head bolts holding the end plate onto the bed and baseplate. Might also need to loosen the big nut in the middle of the leadscrew handle. The latter is recessed so might need a box spanner or at least a socket.
27 March 2025 at 17:34 #790808
Diogenes
Participant
@diogenes
Bazyle’s idea sounds good to me, I think it will help to release the pressure on the leadscrew nut in any case.

Do let us know if you still have difficulties.
27 March 2025 at 21:28 #790839
David ANDREWS 2
Participant
@davidandrews2
Bazyle, Diogenes,

Many thanks. Will let you know how I get on.
31 March 2025 at 13:20 #791253
David ANDREWS 2
Participant
@davidandrews2
Bazyle, Diogenes.

Apologies for the delay. Yes, I did that and it worked. I also disconnected the tension belt to the main spindle to allow hand turning to work the carriage back and also removed the lead screw handle, graduated ring and the spindle guide in order to relieve some perceived stiffness in turning the lead screw. After winding the carriage back to a “safe” position, I re-assembled everything, connected the power, operated the machine through some prudent limits and all is now well again. I also encountered a minor problem with the lead screw handle but that is another matter and I am thinking that one over.

Thank you, both.
31 March 2025 at 13:36 #791258
Bazyle
Participant
@bazyle
Good to know it is all working again.
Hope you fully understand the system on the saddle and tailstock for adjusting the ‘grip’ and play on the bed using both the screws that push the gap apart and the ones that pull it together. Worth putting up a clear label on or near the machine to remind you, especially for the tailstock as it is moved all the time.

You will understand the annoying way the belt tension is adjusted which is so difficult to get at. I made a simple rod with a hole in the end threaded to replace the adjusting nut. This is long enough to project above the headstock for easy access. I really should put a knob on this and make a slot in the cover which I haven’t put in place for decades. I keep the belts very loose until they slip.
3 April 2025 at 14:25 #791796
David ANDREWS 2
Participant
@davidandrews2
Thanks Bazyle,

I have no problem with the forcing and locking screws. My lathe had a manual with it when bought second-hand some years ago, together with an “Erratum;” which corrected the content as printed. I incorporated that with manuscript amendments in the booklet.

The “tip” regarding the belt tensioning nut is appreciated. I have no problems with adjusting “as fitted” though it is a little time-consuming.

Best regards.
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