DRUM/DISC SANDER - HOME MADE at LumberJocks.com

What to watch out for when up-sizing Table Saw motor

Kevin May — Sat, 07 Jul 2012 23:36:18 GMT

I have an old Craftsman saw that does OK for me except when I start ripping 8/4 hardwoods like Walnut, Hard Maple or Jatoba. I’m thinking I could just up-size the motor. This wouldn’t be a big job at all (assuming I can find a motor at a decent price).

My question; is there anything to look out for that I’m not thinking about? (OK, I know to get the same speed motor and to get a single phase 110/220v motor.) Will the increased horsepower cause any problems with other parts of the saw?

Thanks in advance for any valuable input you could provide.

Kevin

Drum/Disc Sander #2: Sander design is complete, construction has begun

Kevin May — Mon, 11 Jun 2012 17:54:50 GMT

Two months in, progress has been made, but of course, not as fast as I would of liked.

Figuring out the motors and drives has been the most difficult part of this project. I have been trying to keep the out of pocket cost as low as I could, and provide the power and control that a sander project of this magnitude needs. I had ordered a 2hp 1ph motor on ebay, but that fell through when the motor was damaged by UPS.

Since then, what I stumbled upon was a motor controller that uses 220v 1ph input to drive a 240v 3ph motor, and provides speed control as well. This as allowed me to use some surplus 3ph motors that were available where I work.

The conveyor is driven by a very small motor, which had a 100:1 ratio gearbox. I have the conveyor assembled and tested and it works well.

For the drum and disc drive motor, I have found a 3hp 3ph motor. I will order the motor controller this week. This will also give me speed control on the drum.

I have the frame about 80% complete, with several of the components for the conveyor lift ready as well. I’m currently waiting on a few parts that the expert machinist here at work will help me with. I hope to be complete within 4-6 weeks.

FINISH FOR OAK FOR OUTDOOR FURNITURE

Kevin May — Fri, 04 May 2012 12:13:21 GMT

I have an outdoor bench with oak seat boards that need a good finish for the outdoor environment. I had finished them with 3 coats of Minwax Indoor/Outdoor Helmsman Spar Urethane. This lasted just about 1 year before it starting flaking. Any suggestions would be appreciated.

Glue up problem - In an end grain cutting board, swelling of one species busting glue up

Kevin May — Fri, 27 Apr 2012 02:25:23 GMT

I have an end grain cutting board made of purple heart and yellow heart. The blocks are squares, 1-1/8” square, about 1-1/2” long/thick, glued up with mixed patterns (making letters). The board was treated with mineral oil. It appears that the yellow heart pieces have swollen from absorbing the mineral oil, and have busting some of the glue joints.

Has anyone ever experienced this type of problem?

Thanks for reading and your comments.

Kevin

Drum/Disc Sander #1: Help / Input request - Speeds for Drum & Disc Sander I plan to build.

Kevin May — Wed, 18 Apr 2012 21:07:08 GMT

Jocks, I need your help with determining the Drum diameter for a sander I plan to build. (see earlier post for image).

The issue is that I have two options (sizes of steel tubing I have) for the diameter of the drum, either 4-1/2” or 6-5/8”.

The design of my Drum/Disc sander has both the drum and the disc mounted on the same shaft. This allows me to drive both with a single 2HP, 1725rpm motor I have.

The primary decision I am faced with is which size drum to build. The size of the drum affects the linear speed of the sanding surface. Searching the web, I believe that the majority of sanders have linear speeds of between 2000 and 2300 ft/min. Disc sanders almost all turn at 1725rpm, regardless of size. (I plan that my disc will be 16” diameter).

The following are the speeds of two basic choices I have been studying:

Motor rpm Pulley ratio Shaft/Disc rpm Drum size Drum surface/linear sanding speed-feet/min
or 1725 5:4 2156 4-1/2” 2032

1725 4:5 1380 6-5/8” 2400

The ratios above were selected to get the drum speed near what I think to be correct, with the disc speed varying quite a bit. I’m thinking that the 1380rpm may be fine for the disc, especially considering I’ll have a 16” diameter. Also, I assume the larger drum diameter would assist with heat dissipation. As I have never operated a drum sander before, my questions to you are really focused on the effects of the speed and diameter on the drum.

Thanks for reading. Hopefully my question is clear. Thanks in advance for any input you can provide.

Kevin

Diary #1: Serious load of wood

Kevin May — Sun, 15 Apr 2012 17:44:01 GMT

I have just purchased roughly 2500 bf of misc lumber for $500. Included is significant qty’s of cedar, white oak, red oak, maple, pine and piles of species I will need help to identify. I’ll report back as I determine what I have. Thanks to some close friends that helped, we loaded 2 truck beds, and 2 large utility trailers.

DRUM/DISC SANDER - HOMEMADE

Kevin May — Sat, 14 Apr 2012 03:03:33 GMT

I have decided to build a combination Drum/Disc Sander. This project is driven by my recently acquired interest in building end-grain cutting boards, and my dislike of hours of sanding those boards. As my day job is related to machine design, this shouldn’t be too much of a stretch for me, beyond the fact that I will get to personally get to do most of the ‘building’ myself. This unit will be built from metal, not wood.

What I believe that is unique (as far as I know) is the combination of the drum and disc sanders as one unit, using the same motor.

To date, I have created a crude design, acquired a conveyor frame and belt (surplus from my day job), acquired some 2×2x1/4” square tubing for the frame from a Craig’s list seller, a 4-1/2” OD pipe 26” long from a nephew, and ordered a 2hp motor from an ebay seller.