ML7 Spindle Pinion

Advert

New Replies

Report Bug

Help/FAQs

ML7 Spindle Pinion

This topic has 6 replies, 3 voices, and was last updated 30 March 2015 at 09:51 by Brian Wood.

Viewing 7 posts - 1 through 7 (of 7 total)

Author

Posts
29 March 2015 at 00:40 #184802
Enough!
Participant
@enough
The pinion at the end of the Myford ML7 Spindle is a tight fit on the spindle and is keyed in place at the factory by drilling a hole (parallel to the axis) through the mating surface of spindle and gear, then tapping it and inserting a grubscrew..

Does anyone have any suggestions/tricks for replacing the gear & grubscrew after removal? It's necessary to align the half-holes rotationally (not too difficult) but also the gear has to be in the correct location axially to get the two halves of the thread to align.

I've done this before and it's always a pain. Today it's being more of a pain than usual.
Advert

29 March 2015 at 00:40 #17654
Enough!
Participant
@enough
29 March 2015 at 09:56 #184816
DMB
Participant
@dmb
Would it be easier to copy Myfords and drill and tap a new locking in a new a new location?
Regards,
John.
29 March 2015 at 10:10 #184821
Brian Wood
Participant
@brianwood45127
Hello Bandersnatch,

In the past with my ML7 I had no trouble with reseating the gear, it fits up to a shoulder. Aligning the hole is also easy if you lock the spindle and rotate the gear gripped in water pump pliers with thick card packing to prevent damage.

Regards

Brian
30 March 2015 at 01:45 #184901
Enough!
Participant
@enough
Hi Brian, I'd got the grub screw started but it locked up after a few threads. I'd tried to tweak it rotationally by tapping on a tooth using a brass drift (which used both hands so I couldn't turn the screw at the same time). The wrench on the gear while turning the screw at the same time worked quite well though. Thanks for that.
30 March 2015 at 01:51 #184902
Enough!
Participant
@enough
Posted by DMB on 29/03/2015 09:56:36:
Would it be easier to copy Myfords and drill and tap a new locking in a new a new location?

I guess it could be done (not too many times though). The difficulty is that I'm doing it in situ and it would need a portable drill – not the best for accuracy plus the fact that the steel is (presumably) fairly tough. I also barely have enough room at that end of the lathe to get the drill in, let alone stand behind it to get some weight on it.

If I took the whole head off the lathe and set it up on the mill-drill it would probably work better …. but that means a realignment when replaced.

Life shouldn't be so hard
30 March 2015 at 09:51 #184915
Brian Wood
Participant
@brianwood45127
Hello Bandersnatch,

If the grub screw is tending to bind and you have the gear fully home onto the shoulder [I would seat it firmly with a nylon faced hammer, assuming all is clean of course to start with] rather than force the screw in I would line up the thread to get the screw started and then take the screw out again to run a tap in and just ease the thread a little. There could be a burred edge here and there from very slight past misalignment—you say you have had it off before. Check the tap needed of course but I suspect it will be 2 BA

Myford didn't intend this joint to be the subject of frequent dismantling. I think taking the headstock off to drill and tap again is a rather desperate thought and brings with it a lot more work than a little retapping!

Regards

Brian
Author

Posts