Table saw arbor question

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Forum topic by Sandra posted 08-26-2013 10:30 AM 2880 views 0 times favorited 22 replies Add to Favorites Watch
View Sandra's profile


7207 posts in 2250 days

08-26-2013 10:30 AM

Topic tags/keywords: question tablesaw

Yes, it’s happened. I learned a valuable lesson this week about lending tools. No lectures please.

I live in a fantastic neighbourhood. Several of the households have relatively handy people living there, and it’s common to hear the power tools going on any given day. One family has been building a deck, and I’ve been over a few times to help.

I offered the use of my jigsaw at one point at they took me up on it. As well as my impact driver. Really, the cost of those tools are not as significant to me as the joy of having great neighbours.

Last weekend, they asked to borrow my table saw. Gulp. It’s a Bosch 4000 which may be pittance for some, but it’s my TS!!

Still, I rolled it over and reluctantly walked away. (OK, if you really can’t help it, now is a good time to lecture)
They used it for the day and promptly returned it.

I went to use it yesterday and could not budge the arbor nut. I’ve had the saw for a few years, and it has always required one good turn with the wrench, and the rest is done by hand. I don’t enjoy changing the blades, but it’s always been a quick job. I sprayed it with PB blaster and let it sit, still no dice.

I finally had to darn near lean on the wrench and I eventually got the nut removed. In one area, the threads of the arbor are now ‘filled in’. With metal. It looks as though the nut was cross threaded, or something.
I casually asked them if they had tightened the blade or changed it, and they said they didn’t.

So finally to my questions – is there any way to fix this, or am I stuck manhandling it every time I want to change blades? Also, what could have caused this? Could I have done it when I was trying to remove the nut?

-- No, I don't want to buy the pink hammer.

22 replies so far

View Monte Pittman's profile

Monte Pittman

29972 posts in 2513 days

#1 posted 08-26-2013 10:39 AM

It was not necessarily cross threaded. It sounds like a thread broke off the nut. You could run a thread cutting die over it to clean it and get a new nut.

-- Nature created it, I just assemble it.

View Picklehead's profile


1045 posts in 2104 days

#2 posted 08-26-2013 11:38 AM

My lecture is: You’re a good person. It’s easy letting somebody borrow something you don’t care too much about. It takes character to lend them your favorite tool. I think/hope Monte’s right. (If so, you could probably tell by looking inside the nut at the threads, one should be missing). Keep on doing the right thing.

-- Quote from ebay tool listing: " Has nicks and dings wear and tear dust and dirt rust and pitting but in good working condition"

View crank49's profile


4032 posts in 3146 days

#3 posted 08-26-2013 12:46 PM

A cross threaded nut would normally leave damage the full length of the bolt (arbor in this case) as far as it was threaded on..
One spot of damage suggests perhaps the arbor got hit by a wrench or something else heavy and hard.
You might want to check for runout to be sure the arbor shaft is not bent.

This is always the problem with loaning tools. The loanee might take perfect care of your stuff, but accidents happen.
And, you can’t really prove that the damage didn’t happen before they got the tool.

The broken thread Monte mentioned is also possible. The fix would be the same in both cases. Run a die over the damaged arbor threads and get a new nut.

View Hopdevil's profile


221 posts in 3261 days

#4 posted 08-26-2013 12:49 PM

Plus one for Picklehead’s response. Having good neighbors are worth a few minor repairs.

-- Buzz ---- Of all the things I have ever lost, I miss my mind the most.

View waho6o9's profile


8482 posts in 2752 days

#5 posted 08-26-2013 12:57 PM

Bosch tech support can help you out as well Sandra.

I’ve called before and they were very knowledgeable and
quite helpful.

View distrbd's profile


2252 posts in 2621 days

#6 posted 08-26-2013 01:58 PM

Sandra,I let a good neighbor use my beloved miter saw and he managed to destroy the blade and the fence in a few seconds,cost? $196. the good neighbor turned out to be a great neighbor and a friend at the end of it all,he also made up for it many times over.

As far as the damage to your TS arbor goes,I hope you have access to a machine shop that has the correct die for that( reverse threaded) arbor but if you have a set of needle files ,maybe you could gently remove the filled section of the arbor yourself,I have done this a few times ,you need patience,and most importantly the correct size file to fit inside the groove/thread ,some lubricant ,and a gentle touch which I’m sure you have plenty of.just file and turn ,then go back and do a bit more.
Best of luck.

-- Ken from Ontario, Canada

View hairy's profile


2780 posts in 3707 days

#7 posted 08-26-2013 03:06 PM

I don’t lend tools , but will offer to cut for them.

-- My reality check bounced...

View Sandra's profile


7207 posts in 2250 days

#8 posted 08-26-2013 05:15 PM

Thanks for the responses gents. I’m going to look into a die tool (quite frankly I don’t even know what that is) and go from there.

And checking the nut is the first thing I’ll do.

-- No, I don't want to buy the pink hammer.

View crank49's profile


4032 posts in 3146 days

#9 posted 08-26-2013 05:21 PM

Here is an image:

View pintodeluxe's profile


5783 posts in 2988 days

#10 posted 08-26-2013 05:26 PM

1+ threading dies. I would replace the nut while you are at it.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

View JoeinGa's profile


7739 posts in 2182 days

#11 posted 08-26-2013 07:23 PM

Call Bosch and order TWO new nuts. Use the first one to clean the threads…. run it on and off several times, scraping or blowing out any shavings or metal that may accumulate inside each time. Throw away that one when you’re done. Then use the 2nd new nut on your saw.

-- Perform A Random Act Of Kindness Today ... Pay It Forward

View joeyinsouthaustin's profile


1294 posts in 2247 days

#12 posted 08-26-2013 09:42 PM

I would be hesitant to do anything but replace the arbor, or in the case of that saw the motor. Each of the times I have stripped an arbor on my unisaw (both from over tightening.. the first me, the second an employee) it was recommended to replace. Not re-tap. Now I am only relaying what my repair expert has recommended to me. And I like the advice of running it by a bosch repair tech. I would call a local cert. shop, the national guys are nice but they will be a lot more tempted to play CYA IMO. I have several of those saws, and replacing the motor is a couple hundred, which is less than what your neighbor would have spent on a new one, and should kindly repay you.. if not take send that neighbor a daily judge judy episode til they get the picture ;)

-- Who is John Galt?

View Sandra's profile


7207 posts in 2250 days

#13 posted 08-27-2013 10:02 AM

Thanks for the suggestions gentlemen.

While I see your point Joey, and may eventually end up doing just that anyway, I’m going to try replacing the nut and threading the arbor first. The Bosch 4000 has served me well, and since I’d like to upgrade in the next few years, I’m hesitant to replace the motor unless absolutely necessary.

First course of action is to take the nut off and see where I can find a die, as well as ordering two nuts.

Stay tuned…

-- No, I don't want to buy the pink hammer.

View joeyinsouthaustin's profile


1294 posts in 2247 days

#14 posted 08-27-2013 12:14 PM

yea… I feel like I am being a bit of a safety nut.. but this one makes me nervous. They are GREAT saws. In my world I have three, and they are “crew” tested. You did not mention how old it is. Bosch has been very good to me regarding warranty issues. Is the saw still under warranty??

Edit: I just spotted my own silly pun… hehe ;) That one wasn’t on purpose, I swear.

-- Who is John Galt?

View hairy's profile


2780 posts in 3707 days

#15 posted 08-27-2013 12:14 PM

I’ve cleaned up boogered threads on a bolt with a hacksaw blade and files.

That was good advice about buying 2 nuts. If its big enough inside, make 2 or 3 cuts from top to bottom with a hacksaw and you have a home made thread chaser.

Usually when a nut is overtightened on a bolt, the nut is damaged.

-- My reality check bounced...

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