Myford Lathe Service

Hi there,

Has anyone recently used the services of Darren and Pete (ex Myford) to service their Myford 7 lathe. If so does anyone have a current email address or telephone contact number.

Thanks,

Colin

I too would like to know the answer to this, Colin.

I tried the mobile number and email address I'd found but did not get a response.

Colin

Random thought - Holidays?

I tried to contact another supplier with no response and when I did get through they said they had been away.

I too am looking for someone or some company to recommission a Super 7. I’m an absolute beginner and inherited my super 7 from a pal who sadly passed away a few months ago. The lathe is in good nick. He gave me a new digital inverter to fit and gave me instructions. I’ve followed them to the letter -but the lathe will only run backwards, even if I put it in reverse! And I keep getting error messages on the rather complex inverter, a TECO L510. I’m also chasing my tail a little on levelling the machine properly. I can spend a month (or two) getting my head around programming the L510 …..then sorting out the fiddly levelling screws (all seem to be different specs!) but I’m willing to pay (well) either a professional or a suitable amateur familiar with the issues to save me those couple of months. Glos/Oxon border.

Roger, if you cannot find a model engineer type from your local club who can help you need an industrial electrician not a domestic electrician and not a lathe servicer unless by chance they know a bit about electrics, Don't even think about levelling until you are not an absolute beginner, it just doesn't matter that much for most things.

thanks Baz. i’ll adjust my search accordingly.

Roger

Do you still have the old single phase motor? If so, you could fit it to the lathe and get used to using the machine. Inverters and infinitely variable speeds are just nice to have. After all almost no lathe had such a drive until recently and many good new lathes are sold with just a single phase motor, belts and pulleys.

JA

That’s good advice JA. I haven’t got the single phase motor…. But if necessary I can look for one.

To level the lathe read Ian Bradley's books, "The Amateurs Lathe" or "The Myford Series 7 Manual"

This will tell you how to go about it and where to adjust to remove any twist from the bed.

To get the lathe to run forwards, since it has a VFD, the motor will be 3 phase unit.

As a non electrician, I believe that the way to reverse the direction of a 3 phase motor is to reverse the connection on one of the phases, at the motor.

Experts out there might like to confirm.

If it works, you will have a lathe that runs forwards, and will allow you to work until such time as someone can sort out the inverter for you.

Howard

Edited By Howard Lewis on 27/12/2021 20:20:44

I have Bradley’s book, thanks Howard, and thanks too for the thoughts about 3 phases…

Here is the manual for your drive. Page 24 is a wiring schematic of the set up. Com and S1 is forwards, Com and S2 is reverse. Check that the 3 phase out of the L510 is correctly connected to the motor as well.

On page 42, the parameters page, if 1 is on the forward reverse parameter -00-01 , it needs to be 0 to get forward rotation from the main VFD panel on off and variable speed etc or the keypad as it is called.

You may need to get someone who knows about vfd controls to help sort out your system.

https://www.tecowestinghouse.com/Manuals/L510_instruction_manual.pdf

Neil

PS, I have sent you a PM with my contact details and further information.

Edited By Neil Lickfold on 27/12/2021 21:29:45

Thank you Neil, that’s very useful! Much appreciated.

That's right, but not when a VFD provides the power. The electronics create 3-phase in a way that causes enormous voltage spikes if a phase is disconnected. They can damage the VFD and the motor. So wire the motor directly to the VFD and use it to control reverse, not switches or a contactor.

Sounds like the Teco 510L isn't set up correctly but start by checking the wiring!

Can Roger post photos please? Might be something obvious. (Instructions here.)

Any Teco experts able to advise?

Dave

By default, the inverter is set to run the motor in one direction only, nominally "Forwards", so as mentioned, above, just swap any pair of the the three power leads around to reverse it.

How have you wired the whole setup, and how are you controlling it; via remote switches, or just from the front panel?

The manual is available HERE if you don't have a digital copy.
https://www.tecowestinghouse.com/Manuals/L510_instruction_manual.pdf

To reverse the motor from the front panel, you would need to change setting 00-01 from 1 to 0; As per page 4-9 from the link above.
Much better to have forward as 1 and reverse as 0, as it will make the remote switch wiring/programming easier.

Bill

Thank you Dave and Bill. A very much a “newbie” to this forum I am decidedly impressed with the willing help by all of you. What a terrific group.

I hope I can repay the advice given in some way but lathes, electronics and the like are not my area of experience ( I’m an amateur blacksmith and retired explosive engineer). I will take all the advice and (carefully) try some of suggestions tomorrow, while taking some photos and noting the wiring. i’ll be back here with the results! thank you all again.
Roger

Hi Roger,

I am only seeing TM1 (NPN) control set up information in the manual, not the TM2 (PNP), nor do I see any switch for selecting NPN (TM1) and PNP (TM2).

Neil

Hi Roger, I had linked the wrong manual. The model L510s comes in two types, One that is NPN or PNP. Your one is PNP as the common connector is 24V. The ability to edit the above reply has gone. Will email the correct information for your drive, and the area to check with the motor plate regarding max current .

http://teco.com.sg/wp-content/uploads/2016/12/L510s-ManualEnglishV02.pdf

Neil

thank you so much Neil. I am moved by your willingness to help a stranger (and burn the midnight oil too!), and indeed by all the other support from others. I hope to be able to repay the favours, or “pay it forward”. I’ll follow your guidance and let you know how I get on.

Hi Roger Davies4,

"retired explosives engineer"!

That sounds like a fun job! Please elaborate!

Many years I was able to take the 3 underwater explosives courses at Fort Bovisand in Plymouth offered by the British Sub Aqua Club.

Had a great time learning the basics and it came in handy once or twice using shape charges on wreck propellers..

Apologies for the thread hijack!

Cheers, Martin