How is it done ?,

This topic has 12 replies, 7 voices, and was last updated 12 November 2011 at 21:15 by Charlie,.

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10 November 2011 at 22:13 #5743
Charlie,
Participant
@charlie18171
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10 November 2011 at 22:13 #77639
Charlie,
Participant
@charlie18171
Hi Chaps,

Must be somone here who knows how its done,I have a Myford

super 7,And on the tumbler reverse two tuffnol gears,One of the gears has

a single tooth missing,I have a new spare, Have removed the whole tumbler

reverse unit but cant see how to remove the the damaged gear, It looks like

it is a force fit in the unit,Dont want to get violent with it but is this a big hammer

and a drift job???,
10 November 2011 at 22:21 #77640
blowlamp
Participant
@blowlamp
I *think* there is a grub screw to lock the shaft into position.

Martin.
10 November 2011 at 23:16 #77641
Charlie,
Participant
@charlie18171
Hiya martin,

Yes there is a long grubscrew with a locking nut that holds the whole

tumbler reverse unit in the lathe,But my problem is how to remove

the spindles on which the tuffnol gears run from the unit once i have it

out of the lathe,But thanks for your input so far,
11 November 2011 at 00:34 #77642
blowlamp
Participant
@blowlamp
Charlie.

Yes, I understand that.

Is there an Allen key type of grub screw through the side of the body that secures the spindle?

Martin.
11 November 2011 at 00:41 #77643
John Stevenson 1
Participant
@johnstevenson1
The spindle holding the Tufnol gear on is just a press fit.

John S.
11 November 2011 at 00:46 #77644
Charlie,
Participant
@charlie18171
Martin

No, once the unit is out of the lathe i can see no means of securing the

spindles to the unit,They seem to have been forced in or shrunk in, I can

see no way of removing them that dose not involve using a certiain amount

of force, And i am reluctant to use force, But there must be a way, I canot

be the first person to want to replace one of the tuffnol gears
11 November 2011 at 01:31 #77645
Chris Trice
Participant
@christrice43267
I think you missed John’s post above.
11 November 2011 at 09:13 #77651
Charlie,
Participant
@charlie18171
Yes Chris

you are right i did miss it, No excuse cept im old and its late, And

thank you John A press fit, That is basicaly what i wanted to know

Very gratefull for the input chaps thanks all,
11 November 2011 at 09:59 #77655
Mike
Participant
@mike89748
Charlie: I had just this problem on a Myford I once owned. Got the spindle out OK, but pressed it back too tightly. Result was that next time I used the lathe on a high speed, the heat of friction set the oil on fire and burnt the new Tufnol gear, so it was back to square one… I was more careful second time around!
11 November 2011 at 10:51 #77657
Joseph Ramon
Participant
@josephramon28170
Mike

You are Chuck the Muddle Engineer and I Claim My Five Pounds

Joey
11 November 2011 at 12:23 #77663
KWIL
Participant
@kwil
Please also be aware that when securing the long grub screw, only take it to the point where it “holds” the unit in place, any further pressure not only makes the operation of the tumbler arm tight, it can also eventually force out the spindle which is a press fit as well.
12 November 2011 at 21:15 #77735
Charlie,
Participant
@charlie18171
Thanks chaps

In spite of there being just one tooth missing on the gear wheel

everything is running well, Its just the damn ticking that gets me

down,Going to have to bite the bullet and do the job somtime soon

Charlie,
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