Strange Noise from Myford Super 7+

[John Manning 5Participant @johnmanning5]

These are working on very fine tolerances and temperature change hot or cold can adversely affect the machine. My super 7 binds the headstock in the depths of winter as the spindle srinks. it has been unuseually hot in the last few days and the clutch could be beginniong to open or the spindle bindind on the outside face of the bearings. Check the side play in the headstock.you will need that funny C spanner that you could not find a use for.

John M

[Bob HeppleParticipant @bobhepple92956]

Well Guy's

you all gave me alot to think about, and as usual I will take the easy way out. Firstly wil get the machine serviced, which will involve taking the spindle out, and I will then check the wick then bearings ect. Thanks for all your comments and John you lightened a dull day when you answered the call. My solution is not the cheapest if a solution it may/not be. but the lathe was used to turn wood by previouse owner so maybe the dust is where it should'nt be.

Bob

[CabengParticipant @cabeng]

Andrew: RDG have a number of items that are are not yet listed on the website, so it would be worth giving them a ring and asking the question.

You could also ask them to measure the length of the main body of the eccentric shaft, which could be compared to that of an S7 – 2.566". The result might be interesting.

John Manning: temperature changes won't affect the clutch assembly as both the operating rod and countershaft are made of steel, so they will both expand/contract by the same amount.

[brickyParticipant @bricky]

hi Bob

I have a S7 large bore that I bought at the Myford Sale weekend.I had the same problem as you describe.After much frustration I thought the seizure was happening in the bull wheel and i adjusted the bearings,there was an improvement but I am not sure wether it was the bull wheel or the main bearing.I was still not getting good performance so I called in the Myford fitters Pete and Darron,this was money well spent and the machine runs beautifully.I do not think my tinkering would ever have achieved this quality of running.The lathe is everything that I would want.

Francis

[John Stevenson 1Participant @johnstevenson1]

Posted by bricky on 10/08/2012 17:51:58:

hi Bob

I have a S7 large bore that I bought at the Myford Sale weekend.I had the same problem as you describe.After much frustration I thought the seizure was happening in the bull wheel and i adjusted the bearings,there was an improvement but I am not sure wether it was the bull wheel or the main bearing.I was still not getting good performance so I called in the Myford fitters Pete and Darron,this was money well spent and the machine runs beautifully.I do not think my tinkering would ever have achieved this quality of running.The lathe is everything that I would want.

Francis

 

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Ironic that you have to pay them for what they should have done in the first place ? And it looks from this thread that your machine wasn't the only one ?

 

John S.

 

 

Edited By John Stevenson on 11/08/2012 18:10:21

[Bob HeppleParticipant @bobhepple92956]

Had my machine Serviced today, I am pleased with the level of service Darren and Pete gave me pease of mind is a highly priced commodity replaced the wick down to spindle as a precaution the old one was glazed no sign of scraping though, hope all goes well. Recommend D P Lather services though.

[Andrew Moyes 1Participant @andrewmoyes1]

I previously raised the problem on this thread of the backgears of my big-bore Myford Super 7 Plus that didn’t line up. David Clark put me in touch with Derek ‘DAG’ Brown who used to demonstrate for Myford. He in turn put me in touch with Darren Boden, the ex-Myford fitter. Both were most helpful and this was the outcome for the benefit of other big-bore users who might have the same problem.

My lathe was made in 2001 and was one of the very first big bore machines. It would have been made with a 67 tooth bull wheel. Around 2006, Myford changed over to a more useful 60 tooth bullwheel but with non-standard DP. My lathe, which was kept by Myford as a demonstration machine, must have been retro-fitted as it has a 60 tooth wheel. Darren explained that some time after this changeover, it was noticed that the backgears sometimes did not line up and fouled the crescent-shaped backgear key, as in my case. A special longer eccentric was made to solve this problem, stamped with a ‘C’ for Connoisseur. This modification had not been applied to my lathe. Darren was sure that such eccentrics would be amongst the spares stock acquired by RDG. I tried them but they did not respond, so I solved the problem myself.

It wasn’t necessary to make a new eccentric but it did mean removing the headstock spindle to gain access. I added a 0.100” thick bronze spacer on the right of the backgear cluster to move it to the left the required amount. On the left hand end, I discarded the circlip holding on the cluster and replaced it by a bronze washer held on by a screw tapped into the end of the eccentric spindle. The washer is stepped to give just the right amount of side play in the gears. I took a guess at the sizes needed and made both parts on the lathe before stripping out the headstock spindle. All is now sorted.

Andrew M

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