Mardrive component Misplaced motor component

[martin bakerParticipant @martinbaker81996]

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 bakerParticipant @martinbaker81996]

[Michael GilliganParticipant @michaelgilligan61133]

Martin,

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

MichaelG.

[martin bakerParticipant @martinbaker81996]

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

[Michael GilliganParticipant @michaelgilligan61133]

Yes; Image is there now, Martin

Unfortunately, I don't immediately recognise it.

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

MichaelG.

.

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

[Phil PParticipant @philp]

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

[Neil WyattModerator @neilwyatt]

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

Neil

[Michael GilliganParticipant @michaelgilligan61133]

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

[Arthur SixsmithParticipant @arthursixsmith43623]

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

[Michael GilliganParticipant @michaelgilligan61133]

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

[Phil PParticipant @philp]

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

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Phil P on 16/11/2015 00:00:54:

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

.

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.

[Phil PParticipant @philp]

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

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Phil P on 16/11/2015 07:28:15:

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

.

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.

[martin bakerParticipant @martinbaker81996]

Thanks to you all.

[AjohnwParticipant @ajohnw51620]

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

–

[Michael GilliganParticipant @michaelgilligan61133]

Posted by John W1 on 16/11/2015 23:18:32:

… 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.

.

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.

[clockwork1957Participant @clockwork1957]

Hi Martin,

Do you still have the Pultra and Mardrive cabinet.

I’ve just purchased one and am reaching out for any links to a parts list for the 1590 and the Mardrive motor drive.

Thanking you in anticipation.

[Author]

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