Drum Sanders

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tusses
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Drum Sanders

Post by tusses » Fri Feb 07, 2014 4:07 pm

Any good for sanding small parts ?
4mm thick, 2" largest dimension ?

if not, what is the smallest part you would put through ?

I'm trying to increase/economise my palm sanding throughput :)

ta

Rich

york33
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Re: Drum Sanders

Post by york33 » Fri Feb 07, 2014 6:22 pm

Nope, not unless you've got a cunning method of holding said small parts down.......not put anything less than about a foot through mine, they need to stay underneath at least two of the hold down bars or they get eaten!

Maybe a smaller drum with less distance between the hold downs would work on slightly smaller bits, but not as small as 2".

I did spy a vacuum conveyor a while ago which would probably work, however it was lots of cash extra on a very expensive sander!

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Re: Drum Sanders

Post by cncpaul » Fri Feb 07, 2014 7:29 pm

2" no chance

Can you not sand before you cut them out ?
Paul

If you only have a hammer then everything looks like a nail

tusses
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Re: Drum Sanders

Post by tusses » Sat Feb 08, 2014 8:18 am

it's the burr from the cutter that just needs a little sanding.
Maybe I could use tabs and keep them in the sheet, but then I'd need a big sander !

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Re: Drum Sanders

Post by jrm » Sat Feb 08, 2014 8:55 am

Double sided tape to a carrier board? Since you have a cnc, you could pocket out the carrier board for your components and forget the tape.

John

tusses
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Re: Drum Sanders

Post by tusses » Sat Feb 08, 2014 3:11 pm

jrm wrote:Double sided tape to a carrier board? Since you have a cnc, you could pocket out the carrier board for your components and forget the tape.

John
Thanks, but I make several 100's of different shapes every day, I expect the tape would forever need changing.
And as they are all different, a pocketed board wouldn't be practical either.

tusses
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Re: Drum Sanders

Post by tusses » Sat Feb 08, 2014 3:12 pm

do you hand/palm sand yours Dave ?

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Re: Drum Sanders

Post by york33 » Sat Feb 08, 2014 6:45 pm

Depends how new the cutter is, they're mostly fine, but if needed I take a ROS with a fine paper and run it over the sheet when they've cut, still on the bed, 30 seconds and done. The bottom face is usually fine with a newish spoilboard. I haven't made any at 2" though so don't know how they'd respond to be a sander like that.

What cutters are you using at the minute? I almost always use cheap Chinese upcuts, cos I'm tight and they work. Every now and again switch to posh ones, but only usually on veneered boards.

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Re: Drum Sanders

Post by york33 » Sat Feb 08, 2014 6:48 pm

What size cutter are you using on the 4mm thick?

tusses
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Re: Drum Sanders

Post by tusses » Sat Feb 08, 2014 7:39 pm

I use wealden cutters £20 a pop :shock:

I use them till they struggle ... cuz I'm tight too :) :lol:

3mm spiral down cut for anthing up to 12mm thick. The upcut ones lifted the small parts up off the bed.
6mm upcut for the 18mm thick

I might try some chinese ones :)

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Re: Drum Sanders

Post by york33 » Sat Feb 08, 2014 8:07 pm

2mm upcut on 4mm (£18 for 10) - runs at 1.8m/min
4mm upcut for 18mm (£28 for 10) - runs at 2.5m/min

Give the 2mm a pop on 4mm, keep the cutting length to an absolute min or they'll snap like matchsticks, 8mm long will go for ages.

The cutters don't lift them but the extraction does, I half shut the gate to it on little bits. On that point, I'm surprised you've not developed a vacuum bed for yours :)

I've played with larger cutters but they don't work for me for a combination of reasons, speed of CNC, lack of vacuum, lack of ATC. I'm just converting the pig pens for CNC no.2!

tusses
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Re: Drum Sanders

Post by tusses » Sat Feb 08, 2014 8:26 pm

I'm running at 120IPM so approx 3M/Min, on everything, but not full one pass depth of cut on 18mm as my router is only 500w.

I haven't had time to do anything but cut and sand for months now ! still haven't replace my Z or added the W/C spindle :(

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Re: Drum Sanders

Post by york33 » Sun Feb 09, 2014 9:49 am

That's why I go with upcut and shiny spoilboard for any little bits, keeps the bottom face clean and the top can be sorted in place with a sander if needed, 4mm doesn't lift much with a 2mm cutter.

Right then, how's this for a random idea, never tried it but it sounded sensible in my head, mind, so do a lot of things!.........

You keep your normal spoil board, when you do the little tiny 2" ones you add another spoil board and then your material. Cut your stuff. Sand the top face with a sander. Pick up both your material and the 2nd spoil board, pop a board of MDF on top, flip it over, remove the second spoil board and sand the bottom face in place. Like taking a cake out of a cake tin, without the sanding bit, obviously, unless your cake is really burnt :)

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Re: Drum Sanders

Post by tusses » Sun Feb 09, 2014 1:30 pm

I was thinking more along the lines of making a tiny drum sander .. proxon sort of size ?

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Re: Drum Sanders

Post by nickw » Sun Feb 09, 2014 2:08 pm

Nick Webb, Fine Furniture, Cambridge
Those who would give up Essential Liberty to purchase a little Temporary Safety, deserve neither Liberty nor Safety.
Banjamin Franklin

tusses
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Re: Drum Sanders

Post by tusses » Sun Feb 09, 2014 2:50 pm

yes, I've seen the DIY ones a few times .. I would definitely need some kind of conveyor system, probably with tracks across to push the small items through.

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