ML10 leadscrew clutch ID?

[Higgins1994Participant @higgins1994]

hi, im in the midst of making a leadscrew clutch for my ML10and have come to drilling it through but unfortunatly i am in a sticky situation in terms of available drills haha. ive got it drilled to 15.90 but the nearest drill up from that that i have is 16.20 :/ has anyone here made one and can tell me if i will get away with that or will it be too loose on the leadscrew? the plain section of mine measures at 15.87 so assuming itll be a bit much

cheers

[Higgins1994Participant @higgins1994]

[JohnFParticipant @johnf59703]

Hi, I think you need to revert to imperial sizes and my guess is the ML10 leadscrew is 5/8" 0.625 inches so best to azure a 5/8? reamer !

John

PS where are yo located ? nothing on your profile !

[not done it yetParticipant @notdoneityet]

Best plan is to try it – drills don’t always cut to their precise size It’s why reamers are preferred. 15.87mm is, indeed, exactly 5/8”. What sort of fit are you requiring? Likely already too big if needing a shrink fit.

[Graham MeekParticipant @grahammeek88282]

From my days of owning a Myford ML10 this hole needs to be either bored or reamed 5/8" or 15.87mm, (15.90mm is top limit on a H7 hole). The finish left by a drill will hardly be good enough. There is also an Oilite bush present in the original Myford assembly for the threaded part of the leadscrew to rotate in. Remember the clutch continues to rotate when the leadscrew is disengaged, or stationary. Without the clutch the normal leadscrew rotates in two Oilite bushed pressed into the Bed. Thus the free end of the leadscrew needs some sort of bearing to support it, as the clutch body rotates. Steel on Mild steel is not a good mix without plenty of lubrication.

Regards

Gray,

[JOHN HORLERParticipant @johnhorler98360]

You will need to bore out the the housing to accept an oilite bush which myfords sell at a reasonable price,

O/d is 3/4" ,bore 5/8", length 1-1/4", if the Bush is not fitted you will wear the leadscrew in no time.

Hope this helps

Regards John

[duncan webster 1Participant @duncanwebster1]

Oilite bushes have a slightly oversize bore as supplied, when you press them in to the correct size hole the bush bore finishes up at correct size. I'd make a plug gauge, measuring small holes accurately isn't easy.

[JOHN HORLERParticipant @johnhorler98360]

Also don't forget to soak the oilite bearing in oil for 24hours before fitting

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