Worn thread on a saw spindle

[pipeclay]

If you go the way of replaceing or repairing your worn spindle have you also found and eliminated the cause of the damage.

[wannabe]

If you go the way of replaceing or repairing your worn spindle have you also found and eliminated the cause of the damage.

That's a good point Pipeclay. For the thread to be damaged like that something has damaged it. It doesn't sound like something you would expect from normal wear and tear.

[wtrueman]

Hi all: I'm thinking the same way, if the nut was not tightened correctly in the past; maybe grime etc. Going further, this shaft is free standing, right? Are the bearings hooped? Or, hope not, bushings. Anyway, there is a chance that this shaft COULD be fixed but not before checking those bearings etc. Good luck, Wayne. BTW, maybe put an add in the local, looking for an exact replacement.

[Kody]

Hi Ray
It looks like you are stuck with a nasty problem. It is vital that in fixing the thread that the integrity of the spindle and thread be preserved. How long and how heavy is the spindle? If the spindle is less than 700mm, are you willing to post it to me? I will weld the threaded section and recut to the correct diameter and recut the thread for you. However, I cannot cut metric threads as the gear I need in the gear train is missing. I can cut any Imperial thread and this would be perfecty suitable.
I can probably obtain a new nut from here and it would be the best way to go. All it will cost you is the postage up and back plus the cost of a new nut. The problem with running a die nut of any kind on the shaft is that the metal that forms the thread may not meet the original specs when it has been reformed. When any metal is lost thru wear and tear, it may not be safe to use it for a part that is highly stressed. It is also very easy to completely strip the thread in some situations. I am quite happy to fix it for you if you want.

Kody

[Ray153]

Thank you all for the advice and offers, I am still inclined to go down the replacement path.

As for the reason for the damage, it is simple. I have committed the sin of using the machine for a purpose other than the one it was designed for. The damage was done by a pulley that took the place of the saw blade. The pulley was used to drive the drum of a home made drum sander built from a ShopNotes plan. I suspect that the worn area has been caused by the grubscrew holding the pulley had vibrated loose, allowing the pulley to rub slightly as the diametre of the pulley was not exactly the product of precise german engineering.

So in a nut shell, there is nothing wrong with the bearings, trunnions etc, like much damage to machines, this was caused by asking a machine to do something it was not really designed for and ultimately, the fault of the operator.

[Chas]

Thank you all for the advice and offers, I am still inclined to go down the replacement path.

As for the reason for the damage, it is simple. I have committed the sin of using the machine for a purpose other than the one it was designed for. The damage was done by a pulley that took the place of the saw blade. The pulley was used to drive the drum of a home made drum sander built from a ShopNotes plan. I suspect that the worn area has been caused by the grubscrew holding the pulley had vibrated loose, allowing the pulley to rub slightly as the diametre of the pulley was not exactly the product of precise german engineering.

So in a nut shell, there is nothing wrong with the bearings, trunnions etc, like much damage to machines, this was caused by asking a machine to do something it was not really designed for and ultimately, the fault of the operator.

Ray, from your last post it seems likely that the damage to the thread is not serious, and the integretary of the clamping force of the nut will not be compromised if you just repair the damaged section. Given that this is a LH thread, the die-nut option will be expensive (and hard to find). As someone else has suggested, careful application of a three-cornered file could be your first option.
If you could post a photo of the damage, it would help to refine the advice.

[Ray153]

I contacted CT Brisbane and was quoted $24.00 with $10.00 postage for a replacement arbor shaft. I had to get the staff member to look at the Grizzly manual so that I knew she was quoting me the right part. I was glad I was sitting down when I was told the price.

I was expecting it to be around the $100.00 mark plus postage.

Now the down side. none in stock....... Has to come from OS aso will be around 1 month (fingers crossed, cheque is in the mail and all that stuff)

Very pleasantly suprised by the cost, at that rate I should buy a dozen........