Mardrive component Misplaced motor component

Four years ago I dismantled my Pultra lathe whilst moving workshops. Only now have I been able to re-assemble the unit but I have come up against problems due to my stupidity ant not noting down where certain parts came from. I have attached an image of a part that I assumed came from inside the clutch cone of the motor but if it is put there the clutch cone cane be returned to its original position. I am hoping in anticipation that someone has had experience of Mardrive units and could advise. Many thanks.

Edited By martin baker on 15/11/2015 17:26:25

Martin,

Sorry to say, your 'image' is missing, and your album only contains two Myford pictures.

MichaelG.

Sorry having problems with adding the image but have done it now I think. Martin.

Yes; Image is there now, Martin

Unfortunately, I don't immediately recognise it.

... I may be back [but don't hold your breath !]

MichaelG.

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Edit: this page has a cross-sectional drawing, taken from the Patent, but shows nothing that I recognise as your component. [Both of mine are incomplete, and presently inaccessible]

Edited By Michael Gilligan on 15/11/2015 17:50:11

I does not look like part of a Mardrive to me, I have the type that is built into a lathe cabinet and there is nothing like that part in it.

Phil

It looks like the sprung roller of a limit switch to me?

Neil

I don't think it will help, but here & here & here are the early Patents

Note the somewhat surprising Applicant.

MichaelG.

Edited By Michael Gilligan on 15/11/2015 22:08:11

Edited By Michael Gilligan on 15/11/2015 22:10:09

We used this type of clutch/motor on sewing machines. The spring and roller whent down the motor shaft to keep the flywheel and pulley apart. Hope this helps Arthur

Arthur,

So ... is it item 'd' on the sectional drawing?

I felt sure that mine just had a 'button' ... but the roller would make sense.

Thanks for joining us.

MichaelG

I can tell you for sure item D is just a short pushrod with a spring connected to the back end of it.

In normal operation the clutch friction ring is held apart by this spring so it does not drive, when the pedal is pressed it pushes the cone pulley inwards and contacts the friction ring thus taking up drive until the pedal is released.

I reckon the part in the photo is from somewhere/something else.

Not sure why the patent applicants name is surprising, mine has the 'Marine Engineering Co' name on the main motor plate. That is where the name "Mar" drive comes from isn't it ?

Phil

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Yes, Phil ... It is obvious when you already know [which I did], or if you happen to have an original motor with that nameplate [one of mine does, the other does not].

But anyone presuming that the famous Pultra MarDrive unit might be the intellectual property of Pultra would probably struggle to find the Patents.

I was just trying to help, by putting a little more information where people might easily find it.

MichaelG.

From the way you worded it, it sounded like "you" were surprised by the patent application name. You could have explained it to everyone if you had wanted to.

Perhaps I had better mind my own business in future posts of yours if I have spoken out of turn.

Phil

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Phil,

No, I don't think you have spoken out of turn ... but, equally, I didn't think it was worth 'explaining it'

There has been enough nonsense on this forum in recent days; let's just all work together.

MichaelG.

Thanks to you all.

Not sure but this page shows some copies of drawing from the patent but near the top is a "photo" of a cord passing over a pulley to operate the clutch. It's not clear but it looks like something like your part might be connected to the cord.

**LINK**

John

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John,

For info. ... That 'cord' was a chain [lightweight flat links]

There is a very useful little video, here, showing a bench-mount MarDrive unit in very original-looking condition.

MichaelG.