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Forum topic by RootandBranch posted 06-30-2016 05:25 PM 729 views 0 times favorited 5 replies Add to Favorites Watch
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241 posts in 1882 days

06-30-2016 05:25 PM

I have a Mark V. When I have the sanding disk mounted and turn the power on I get about a second of horrible grinding/growl noise that stops once it ramps up to speed. Only does it with the 12 inch disk and only for a brief moment. Doesn’t do it with the lathe chuck mounted with any jaws or the cole setup. Doesn’t do it with the drill chuck or hooked up to the bandsaw. These are the only configurations I use. I always start it slow and slow it down to turn it off. Once it’s up to speed I don’t notice any unusual vibration or wobble.

Anyone have any idea what I should focus on before I pull covers?


-- Don, -

5 replies so far

View Mark Wilson's profile

Mark Wilson

2833 posts in 1841 days

#1 posted 06-30-2016 06:22 PM

My Mk5 (1956) also makes some noise with the sanding disk. It’s so brief, however, that I don’t even think about it. I know the machine needs, at least, a new quill – the splines are probably worn down. When I have something in the chuck that extends more than a few inches, there’s a wobble that requires use of the tailstock for support. I love the old girl, but, I’d sure like to replace her with something more modern. How old is your baby, Don?

-- Mark

View RootandBranch's profile


241 posts in 1882 days

#2 posted 06-30-2016 06:57 PM

No idea how old it is Mark. The original owner probably got it when he retired 30 years ago. Retirement got in the way of him actually using it much so he gave it to a friend of mine who never assembled it. Sat in his warehouse collecting spiders and bird nests until I got it….free.

Like you I’d like to update my tools but I’d need to purchase a lathe and a bandsaw to replace the SS. It still does most everything I need it to do and does it well enough. This sound it’s making ain’t right and when it comes to machines that can hurt me, I don’t like “ain’t right”.

-- Don, -

View Snowbeast's profile


136 posts in 2116 days

#3 posted 06-30-2016 11:27 PM

Don – You probably want to take a good look at the bearing on your quill assembly. Sounds like you have an older one-bearing setup and it could be going (or already gone) bad. The newer two-bearing quill assemblies are sturdier and quieter.

That 12” sanding disk is a lot of weight to be spinning on a bad bearing.

Mark – I don’t know if the two-bearing quill will fit your older machine but it’s worth some investigation.

View htl's profile


5136 posts in 1937 days

#4 posted 07-01-2016 01:30 AM

Look for the Serial Numbers of the MARK V and when you get them go to this site and you can find out how old your SS is.
Do a search there and you’ll find all the info you need for your great tool.
I own and use two of them everyday.

-- An Index Of My Model making Blogs

View Gene Howe's profile

Gene Howe

12186 posts in 4206 days

#5 posted 07-01-2016 12:27 PM

The two bearing quill is a major improvement. Sounds like it’s time, too.

-- Gene 'The true soldier fights not because he hates what is in front of him, but because he loves what is behind him.' G. K. Chesterton

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