I am going to make a wide drum sander - Page 3 - Woodworking Talk

BudK · 11-05-2008, 11:30 AM

That's nifty , Daren . Look's like you made an extra beefy table ,too .

mics_54 · 12-10-2008, 01:41 PM

Waiting for an update Daren. Is the drum working with the PVC?
How about the feed?

**Daren** · 12-10-2008, 02:07 PM

Too many irons in the fire to install the power feed yet. Yes manual feeding things are still working fine, but I am not using it much right now (which explains my hesitance to spend the big bucks to buy one and just making one myself). I did find the belt material, ebay $9.99-only bidder

for what I priced at $200+ someplace else. Threadmill belt for a health club type machine, 144" long and high grade stuff.

I just need a DC motor controller to adjust the motor speed (slow it to a crawl) but give me all the torque still. The motor is a honker for it's small size, 2 1/2 HP 17 amps...but it is DC, it says 130 volts DC but reading the wiring schematic if I could find even a 0-90 VDC motor controller I would be in business. The controls from the pillaged treadmill would not work, they where wired through a heart monitor/bed up-down thing...just all kinds of stuff (that would fail used on a sander for sure) I just need a dial, that's it. Just a 110V AC in with a potentiometer to control the DC going out to the motor. I am not too sharp on things electrical really.

Since this is a budget build the power feed is on hold. I have watched a few controllers sell on ebay that I thought would work for like $80, but I never pulled the trigger.

John in Tennessee · 12-11-2008, 10:16 AM

Find a tread mill. You'll have the belt, speed control and maybe a motor.

mics_54 · 12-11-2008, 10:37 AM

**Daren** · 12-11-2008, 10:50 AM

Quote:

Originally Posted by mics_54

(he's from Tennessee...he'll catch up here shortly)

**Daren** · 12-12-2008, 12:35 PM

Duh, it just dawned on me I have a router speed controller that should work.(?) I bought it for something else, never used it and stuck it away. I will dig it out later and see (I know I blew the fuse in a previous "experiment", gotta get some fuses first)

**TexasTimbers** · 12-26-2008, 11:49 AM

The amp rating on the pot is high enough (20) but I have never thought about using a pot designed for ac in a dc application. I don't think it will work.

You will have to put the pot inline with the ac input to the dc motor. Where is the ac being rectified - in the motor itself? Or does it have an external power supply?

You can use the pot for the ac input and I do not thik it will effect the ability of the rectifier to convert it to dc. The rectifier will just see a smaller and smaller wave but I can't imagine it would not just put out a smaller and smaller wave of dc. With that big of a motor it is full wave rectification i think so it should not have a dramatic power loss.

If it doesn't work mayve you can find a rheostat big enough? I think you can put that in the dc circuit and control the voltage that way. A potentiometer is simply a voltage divider remember, has 3 terminals. A rheostat has two, and channels the voltage through a resistor in varying amounts to control the votlage.

Not saying I know for sure though it's been a while since I scratched my head about anything like this.

**Daren** · 12-26-2008, 12:13 PM

I have the AC to DC converter (inverter ?) from the treadmill I got the motor from. But had no way to control the DC output to the motor, too many other things in the lumped together circuit boards before it got to the potentiometer . I was getting full DC voltage bypassing all that other unnecessary stuff. The router controller says it will work on all ac/dc brush type motors.

**TexasTimbers** · 12-26-2008, 12:23 PM

I have another idea. See if the controller says it's rated for both ac AND dc.

Quote:

Originally Posted by Daren

The router controller says it will work on all ac/dc brush type motors.

Derryl James · 12-29-2008, 10:34 PM

Looks good Darren ! Make sure you post some pics when your done !

Terry Beeson · 12-30-2008, 09:19 PM

Pot? AC/DC? Amps?

Have I stumbled into a heavy metal forum?

AZ Termite · 01-10-2009, 08:57 AM

Hey Daren,
Is the PVC still hanging in there. I think I may try my hand building one to. I could really use one but $1500 for the one I really want is out of the question at this point. BTW that thing is cool. I never thought about building one until I found this site and saw this thread.

**Daren** · 01-10-2009, 09:19 AM

Quote:

Originally Posted by AZ Termite

Hey Daren,
Is the PVC still hanging in there.

, no problems yet. Granted I don't use it every day, but it is handy (and worth the time/$ invested) when I do need it.

AZ Termite · 01-10-2009, 09:47 AM

I found a plan that looks like it will work nice. I have alot of the stuff I need to build it. I may be able to do it for about $100, I want to start turning segmented bowls and have no good way to get rings flat.

rrobor · 07-22-2009, 09:16 AM

If I can give you all advice on building the beast, its fairly simple. You have a few errors in design of the drum, I built one, I needed 1.2m and built it exactly like that and it worked for a time. Now during use the drum heats up a bit and the PVC becomes a bit softer, then it can enter a phase where the drum reaches a harmonic, when that happens it can shake your teeth out. Solution is make your drum out of craft wood disks, Glue them all together on your steel shaft, then run this and like a lathe work that down till your PVC fits. I use 4" wide paper on the diagonal and thats fine, you only need to glue it for half a turn each end. I have glued paper together where the paper could be peeled in bottom and top layer, so it was a splice joint. I am down under doing very hard wood, never tried it on your softer type woods so will be interesting. Another issue I have is a slight snipe at each end. I expect that now so my benchtops are an inch oversize. They also create dust, try as you may you wont suck it all up.

woodwurm · 09-12-2009, 11:34 AM

Quote:

Originally Posted by Daren

And yes I have seen those kits. #1 I am cheap, #2 I already have most of the stuff #3 Kits ? who needs a stinkin' kit, I like to do things the hard way

Hi there i thought i was the only one that rather make my own contraptions then buy, as you say you are cheap well so am i because im sure one could make most

rrbrown · 09-12-2009, 06:17 PM

Quote:

Originally Posted by rrobor

If I can give you all advice on building the beast, its fairly simple. You have a few errors in design of the drum, I built one, I needed 1.2m and built it exactly like that and it worked for a time. Now during use the drum heats up a bit and the PVC becomes a bit softer, then it can enter a phase where the drum reaches a harmonic, when that happens it can shake your teeth out. Solution is make your drum out of craft wood disks, Glue them all together on your steel shaft, then run this and like a lathe work that down till your PVC fits. I use 4" wide paper on the diagonal and thats fine, you only need to glue it for half a turn each end. I have glued paper together where the paper could be peeled in bottom and top layer, so it was a splice joint. I am down under doing very hard wood, never tried it on your softer type woods so will be interesting. Another issue I have is a slight snipe at each end. I expect that now so my benchtops are an inch oversize. They also create dust, try as you may you wont suck it all up.

Another solution is use ABS pipe. PVC can only handle heat to about 60 C before it gets soft enough to change shape, but ABS can go to 180 C. Learned that when making a hydrogen generator.

fingers5 · 10-11-2009, 12:33 PM

I made a drum sander useing a wood lathe as the driver
the height adjustment was 2 pieces melanie chip board hinged
clipped to lathe bed with adjusting height screw
This way i have several control speeds built in
Tread your own path
Ernie D
fingers5

dbhost · 10-27-2009, 12:46 PM

So inquiring minds want to know. How did it turn out? Is the PVC drum holding up as you had wanted or do you need to switch to a different material?

I saw your demo video, and while it looked pretty good, the one thing that came to mind was is he going to do anything about dust collection or just live with it as the dust flies?