ausmini :: View topic - rod change mainshaft oddity

yeah 18mm is the A+ size

so it could be to mix-n-match or maybe just to repair a worn out set

either way i don`t like it spinning & if it`s not "HARD" then it`s rubbish :-)

Someone has sleeved it as I do for repair, but they have NOT used a bearing inner ring. These are hardened RC62 or better for running rollers on. The ones I use are p/no IRT 1020-2.
These rings are 14mm OD and 10mm ID x 20mm long. They are a bit long but I grind the end back flush, once fitted.

The fact that i can see a lip and drmini says it's 14mm, not 13.8 tells me it's stuffed :shock:

So i guess the shaft you checked the measurement against is stuffed as well :lol:

This is of course presuming you are adhering to correct measuring practices

Give them .0005" (1/2 a thou) interference fit. I warm them a little with the hot air gun, then push them on with the tailstock. A drop of oil on the shaft helps.

Author:	simon k [ Sun Apr 21, 2013 5:23 pm ]
Post subject:	rod change mainshaft oddity
I am doing a rod change box for a mate, and pulling it apart I found this. Looks like the main shaft has been machined down and a new bit machined up. It's a neat fit, but does turn and looks like it's been fretting a bit, and not as hard as the original shaft. It measures 13.88mm (meant to be 14mm, right?) is this normal practice if a shaft is damaged? should I be concerned?

Author:	TheMiniMan [ Sun Apr 21, 2013 5:40 pm ]
Post subject:
yeah 18mm is the A+ size so it could be to mix-n-match or maybe just to repair a worn out set either way i don`t like it spinning & if it`s not "HARD" then it`s rubbish

Author:	simon k [ Sun Apr 21, 2013 6:35 pm ]
Post subject:
TheMiniMan wrote: yeah 18mm is the A+ size so it could be to mix-n-match or maybe just to repair a worn out set either way i don`t like it spinning & if it`s not "HARD" then it`s rubbish sorry, OD is 13.8mm, ID is something like 10.5mm, it's a normal A series input shaft

Author:	TheMiniMan [ Sun Apr 21, 2013 7:10 pm ]
Post subject:
ah , my mistake,,, where`s my glasses??? Yeah ok it`s got to have just been an attempt to repair then seen em plenty times before, some good , some not so good

Author:	simon k [ Wed Apr 24, 2013 5:23 pm ]
Post subject:
oops, sorry Matt, forgot to reply - thanks muchly There is a stamping on the casing from a mini specialist I trust, so I think it might be one of the 'good' ones - will stick with it I measured a standard shaft and it is the same size

ausmini https://www.ausmini.com/forums/

rod change mainshaft oddity https://www.ausmini.com/forums/viewtopic.php?f=5&t=81170	Page 1 of 1

Author:	mini_mad_matt [ Wed Apr 24, 2013 9:38 pm ]
Post subject:
I reckon i can see a lip on the sleeve in the first pic. But that is just from where i'm sitting.

Author:	drmini in aust [ Wed Apr 24, 2013 9:44 pm ]
Post subject:
Someone has sleeved it as I do for repair, but they have NOT used a bearing inner ring. These are hardened RC62 or better for running rollers on. The ones I use are p/no IRT 1020-2. These rings are 14mm OD and 10mm ID x 20mm long. They are a bit long but I grind the end back flush, once fitted.

Author:	simon k [ Wed Apr 24, 2013 10:01 pm ]
Post subject:
drmini in aust wrote: Someone has sleeved it as I do for repair, but they have NOT used a bearing inner ring. These are hardened RC62 or better for running rollers on. The ones I use are p/no IRT 1020-2. These rings are 14mm OD and 10mm ID x 20mm long. They are a bit long but I grind the end back flush, once fitted. interesting - I'll ring my bearing man mini_mad_matt wrote: lip there is a lip there...

Author:	drmini in aust [ Wed Apr 24, 2013 10:07 pm ]
Post subject:
Give them .0005" (1/2 a thou) interference fit. I warm them a little with the hot air gun, then push them on with the tailstock. A drop of oil on the shaft helps.

Author:	mini_mad_matt [ Wed Apr 24, 2013 10:42 pm ]
Post subject:
The fact that i can see a lip and drmini says it's 14mm, not 13.8 tells me it's stuffed So i guess the shaft you checked the measurement against is stuffed as well This is of course presuming you are adhering to correct measuring practices

Author:	simon k [ Wed Apr 24, 2013 11:31 pm ]
Post subject:
mini_mad_matt wrote: The fact that i can see a lip and drmini says it's 14mm, not 13.8 tells me it's stuffed So i guess the shaft you checked the measurement against is stuffed as well This is of course presuming you are adhering to correct measuring practices it might have been 13.9, but yeah... there's some wear there I didn't want to strip the mainshaft! the synchros are all good, it was just a clean out and replace the big bearings grrr

Author:	simon k [ Wed Apr 24, 2013 11:36 pm ]
Post subject:
drmini in aust wrote: Give them .0005" (1/2 a thou) interference fit. I warm them a little with the hot air gun, then push them on with the tailstock. A drop of oil on the shaft helps. thanks Kev

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