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1st September 2012, 09:45 PM #1SENIOR MEMBER
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Oops! May have damaged something!
G'day All,
I need some help. Today I was cutting some threads on my Hercus 260ATM. I noticed some slack in the lead screw.
I attempted to tighten the nut on the end of it by turning it with a spanner whilst holding the chuck with the chuck key. I may of had the back gears engaged (not sure).
Well, something slipped or snapped. Now I have no feed at all. The twin reverse gears and idler gear do not mesh now.
I can engage select and engage gears in the Norton Gear box but that's it. The lead screw is now very loose, so I feel like I've broken teeth or maybe a key.
Any suggestions? I think I may have to pull the gear box off and have a look around. I can post photo's of the gears if needed.
And to top it off the missus is in the first stages of labour (no panic, its our fifth).
Cheers Ben
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1st September 2012 09:45 PM # ADSGoogle Adsense Advertisement
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2nd September 2012, 01:22 AM #2GOLD MEMBER
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Not sure what you have done in regards to the reverse tumblers,normally the only reason they wont mesh is the teeth have striped of the gears,the selector lever is in neutral.
Cant be sure but I think there is a key on the leadscrew,think there should also be a nut which holds the gear on that is attached to the leadscrew.
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2nd September 2012, 10:22 AM #3SENIOR MEMBER
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1 undo the leadscrew carrier on the right side of the bed and slide lead screw to the right from the gear box there is a very small half moon key that engages the lead screw to the gear box
try looking there first
2 is the banjo that holds the gear train to tumbler gears come loose and disengaged
ps i leave that nut loose on the leadscrew and just let the machine take up the free play pipe clay may have some thoughts on this
john
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2nd September 2012, 10:29 AM #4SENIOR MEMBER
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Hi Pipeclay,
I should of said, none of the teeth seem to be stripped. Its like I've pushed the banjo down somehow. The teeth are just touching.
I think I've knocked the key out of the lead screw. If I get the chance today I'll pull the lead screw off and have a look.
Ben
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2nd September 2012, 10:36 AM #5GOLD MEMBER
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Are you talking about the Banjo bracket that the change gears attach too or are you talking about the reverse tumbler bracket?
If it is the reverse tumbler it only has 3 positions For/Rev/Neut.
If its the banjo bracket then the square headed screw may be slightly loose.
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2nd September 2012, 11:32 AM #6Pink 10EE owner
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2nd September 2012, 07:35 PM #7SENIOR MEMBER
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I'm pretty sure that's what I've done. I don't know what I was thinking trying to tighten the leadscrew the way I did - I've taken the leadscrew off before (the correct way).
I took a photo this arvo. Its the stud and idler gears not meshing.
Anyway, thanks for the advice. I will fix her up when I can (the baby didn't come last night, but we did spend half the night in the maternity ward).
Cheers Ben
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29th September 2012, 02:31 PM #8SENIOR MEMBER
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Hi,
Finally got around to fixing my lathe.
"That is what usually happens when you overload the drive train.... The banjo slips down out of mesh..... So you just loosen the square nut and remesh it.."
That's what happened. Just loosened the square nut, so I meshed the gears and tightened the nut and hey presto problem solved.
I do however still have the original problem of the lead screw being slightly loose in its housing, about 2mm. I'm not sure how to remove the washer to take up the clearance. There's a small slot/hole which I thought may of held a hex bolt but doesn't. Any ideas? The 3rd photo shows what i mean. The 1st photo shows the clearance i want to take up with a brass washer.
Cheers Ben
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29th September 2012, 08:00 PM #9GOLD MEMBER
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Have you tried holding the leadscrew in a vice.
If you havent got soft jaws just grab the leadscrew as close to the end as possable in the vice apart from a few marks on it,it wont be to bad not much work performed up there if any.
If you are not having trouble removing the washer which shouldnt be tapped but cant get the leadscrew through the bearing housing you may need to grip the housing in the vice and knock or push the leadscrew through it,there may just be a slight bur stopping the washer from coming off.Last edited by pipeclay; 30th September 2012 at 09:46 AM. Reason: more
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30th September 2012, 08:57 AM #10Senior Member
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I wouldnt go holding your leadscrew in a vice. Its a precision thread and could be damaged by a vice pretty easily.
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30th September 2012, 05:55 PM #11SENIOR MEMBER
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Hi Pipeclay,
Had to go up to the coast for family duties. The washer is on tight, so tight that I was thinking there might of been a grub screw in that hole. I don't think there is, so maybe a punch to get it moving? Just don't wont to do any damage to the lead screw. I'll have a look at it tomorrow.
Cheers Ben
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30th September 2012, 06:33 PM #12GOLD MEMBER
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