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sixteen inch disc sander I intend to make?

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Forum topic by SCOTSMAN posted 06-10-2014 08:41 PM 585 views 0 times favorited 10 replies Add to Favorites Watch
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SCOTSMAN

5361 posts in 2237 days


06-10-2014 08:41 PM

I used to own a sixteen inch disc belt sander and swapped it to a a guy for a compressor ( turned out to be a bad move he sold it on ebay a few weeks later for sixteen hundred pounds.Anyway I have now bought a twelve inch disc sander with an undercarriage base cabinet to house a dust extractor vacuum machine which is designed to cut the vacuum of a few minutes after switching it off from the front. It really is very dust efficient.I now have a largeish selection of sixteen inch sandpaper discs which the other guy bought some off me a very few but not all I had. Anyway I intend to make myself a nice professional sixteen inch disc sander from scratch using a nice powerful motor of which I have several to choose from . I have a nice big sheet of aluminium treadplate approx quarter inch thick which is a lot more than I need which I intend to use back to front i.e smooth side facing forward . I am thinking of using this for the faceplate which is what I would like my pals here to help me come to a decision hence this post . First of I could cut the aluminium sheet to a square. I need to find out and would be the easiest way to make it perfectly round. I figure I could cut it roughly with my bandsaw almost to shape perhaps a shade over sixteen inches and since my metal lathe will not cut sixteen inches, (it is max ten inches ) anyway after a bit of headscratching I considered fitting it through a centre hole which I would need to drill anyway ,and fixing it perhaps to a chuck on my larger woodlathe and try to cut it from the toolpost with a high speed steel parting tool woodturning type taking things easy of course it does work on metal metal I have done it before. I could also set up a wooden jig as did Norm abram many times on t v to do it more carefully on the bandsaw or even on my milling machine.This is done by setting a piece of wood onto the machines table and clamp it tightly to the table then setting a dowel eight inches from the cutting blade or cutter The disc is set onto the dowl tight-ish fit and slowly revolved untill a perfect circle has been achieved. I can do the rest of the machine myself just need advice on the disc really .I could buy a steel disc for around twenty five pounds but am to mean . I would rather use what I have in the way of materials.I could also make the disc much easier with mdf or plywood what do you guys suggest or do you know a british seller of a disc dedicated for a sanding machine??? Alistair

-- excuse my typing as I have a form of parkinsons disease


10 replies so far

View TheFridge's profile

TheFridge

824 posts in 138 days


#1 posted 06-10-2014 08:55 PM

I would think mounting on the lathe and turning it would work great.

-- "We build our workshops. Then we enjoy the fruits of our labor by laboring for more fruits." - Me

View higtron's profile

higtron

194 posts in 1329 days


#2 posted 06-10-2014 09:40 PM

I made a 10” powered by my Lathe here is the blog entry http://lumberjocks.com/higtron/blog/31503 good luck scotsman

-- If I cut it too short I can scab a piece on, but if it's too long what do I do?

View mpounders's profile

mpounders

732 posts in 1547 days


#3 posted 06-10-2014 09:44 PM

I would use a circle sanding jig on my 12” disk sander?

-- Mike P., Arkansas, http://mikepounders.weebly.com

View Crank50's profile

Crank50

91 posts in 228 days


#4 posted 06-10-2014 09:57 PM

Those little diamond tread patterns will possibly get in the way of your mounting.
Aluminum is gummy and will tend to grab your cutting tool. Be careful if you turn with a hand held tool.

I have once turned an almost perfect disk by simply mounting a rough approximate disk on a bolt held in a big heavy vise and captured between two washers, loosely so it could spin. I then used an angle grinder held very lightly against the edge and at a slight angle so the spinning grinder caused the disk to spin.

Having said all this, if I could buy a steel disk, already round and with the center hole drilled for less than $75, that’s the way I’d go. . preferring the weight of the steel.

View patron's profile

patron

13034 posts in 1993 days


#5 posted 06-11-2014 02:13 AM

that tread-plate you got
i might be somewhat leery of

at 16” it might ‘flex’ to much
or with the tread stuff
be hard to balance
(more tread on one side than the other)

i would go with the MDF myself
(being scottish too)

easier to work and replaceable
double it up

just do as mpounder said
and final round on the 12” disk

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View exelectrician's profile

exelectrician

1558 posts in 1079 days


#6 posted 06-11-2014 03:09 AM

The edge speed increase from a 10” to a 16” is a huge step. Also the cost of sanding discs is something to consider, as is the ease of swapping grits, when I had my 16” I regretted my purchase from day one, my progression was almost like the “bigger boat syndrome” I now have stepped back from a 10” which I sold. I now have a 8” which I am almost happy with

-- Love thy neighbour as thyself

View Rick M.'s profile

Rick M.

3954 posts in 1032 days


#7 posted 06-11-2014 03:44 PM

I don’t believe 1/4” aluminum will be thick enough without reinforcement, it will vibrate around the edges. Also you may have to true the face unless your drivetrain is perfect and the plate dead flat which it probably isn’t.

-- |Statistics show that 100% of people bitten by a snake were close to it.|

View SCOTSMAN's profile

SCOTSMAN

5361 posts in 2237 days


#8 posted 06-11-2014 08:41 PM

Just found this would it be better do you think?Alistair

http://www.ebay.co.uk/itm/320522082859?_trksid=p2055120.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

-- excuse my typing as I have a form of parkinsons disease

View patron's profile

patron

13034 posts in 1993 days


#9 posted 06-11-2014 11:05 PM

don’t know about the price alistair

but they do look like dinner plates to me
with a lip and rolled edges

how would that help you

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View MrRon's profile

MrRon

2830 posts in 1895 days


#10 posted 06-12-2014 06:05 PM

I wouldn’t think the plates would be guaranteed flat.

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