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disc sander runout

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Forum topic by brucet999 posted 04-18-2019 12:02 AM 291 views 0 times favorited 7 replies Add to Favorites Watch
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brucet999

8 posts in 144 days


04-18-2019 12:02 AM

Topic tags/keywords: disc sander quality tools

I’m shopping for a 12” disc sander. Few stores have them on display around here and two of those display models I have seen (<$200) have had 1/16” (.0625) runout on the disc face. I think acceptable runout should be more like 0.005”.

Am I wrong?

What is acceptable runout for a bench mount 12” disc sander?

The old Delta machines were very good and pretty much bullet proof. Now they seem to be poor quality machines, according to online reviews citing cupped tables and serious runout.

What machine(s) would you guys recommend?


7 replies so far

View CarlosInTheSticks's profile (online now)

CarlosInTheSticks

368 posts in 789 days


#1 posted 04-18-2019 02:06 PM

1/16” is a lot of run-out, the owner could probably have brought it back for a replacement. Can’t think of a model that is not an import nowadays, some imports are better than others. Delta is now owned by a Taiwan company. I have found tools coming out of Taiwan are well ahead of what is coming out of mainland China, just like Japan is half a century ahead of the rest of Asia and are considered a high end source now.

When your measuring in the thousanths I think all 12” discs are going to have a little run-out the nearer you get to the edge. Fortunately or unfortunately depending on how you look at it, discs are all made from aluminum nowadays and you can touch them up with a simple sand paper block, within reason, to much and you will get vibration.

I have 3, 12” discs from Busy Bee in Canada similar to Grizzly in the US, never had a problem with them and I abuse them all the time with my metalwork,ha,ha. They still try to source out of Taiwan when ever possible. Long established names like Delta have greater control over the manufacture of their products and so are less likely to run into a dud with there name on it.

-- "There are no utopias, chaos theory reigns, anyone who says different is selling you something"

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Planeman40

1420 posts in 3178 days


#2 posted 04-18-2019 02:22 PM

My guess is these cheap Chinese machines have cast iron castings for the disk and the castings haven’t been aged to allow stresses that build up in cooling to settle before machining. Thus these machined castings warp AFTER machining. A well known problem with cast iron.

-- Always remember: It is a mathematical certainty that half the people in this country are below average in intelligence!

View Markmh1's profile

Markmh1

105 posts in 860 days


#3 posted 04-18-2019 02:42 PM

I have a 12” Jet. I bought this some time ago and it has served me well.

1/16 is way too much runout IMO. Wow, I wonder what that company would reject! Unless Carlos is right
and that gem has been returned and the retail store just put it back out, there doesn’t seem to be a lot of QC
there.
I did look at Delta when I was in the market, but rejected it because of only 1/2 horsepower. IMO, you need
at least 1 HP. I’ve never been able to stop the Jet, or even slow it much.

With the knowledge that there is real garbage lurking out there, you might be best to see what a company
guarantees acceptable before ordering one in. Even so, returns are never pleasant.

Good luck!

Mark

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CarlosInTheSticks

368 posts in 789 days


#4 posted 04-18-2019 02:42 PM

No their all aluminum too, it’s the cheapest and easiest way to go for the consumer market. Iron would be a big step up, now relegated to industrial machines and old antiques.

But yes I know what your saying about poorly aged castings that end up warping, still a problem with the cheaper stuff.

-- "There are no utopias, chaos theory reigns, anyone who says different is selling you something"

View MrRon's profile

MrRon

5564 posts in 3660 days


#5 posted 04-18-2019 08:41 PM

I made my 12” disc sander using a spare motor and a 12” aluminum disc from a Shopmith; zero runout.

View WhyMe's profile

WhyMe

1159 posts in 1978 days


#6 posted 04-18-2019 08:53 PM

I have a Harbor Freight 12” disc sander and surprisingly the disc is flat. The table is flimsy junk.

View CarlosInTheSticks's profile (online now)

CarlosInTheSticks

368 posts in 789 days


#7 posted 04-18-2019 09:42 PM

Awesome MrRon, having an accurately bored disk makes all the difference. Heres the table for it, I’d post it here but might be an issue since it is not my plan. It’s for a 8” disk, easy to adapt dimensions for a 12” disk.

https://hobbyworkshopprojects.blogspot.com/2019/04/short-woodworking-plans.html

-- "There are no utopias, chaos theory reigns, anyone who says different is selling you something"

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