|Project by George M||posted 06-23-2011 03:01 AM||9704 views||102 times favorited||26 comments|
This is my latest shop built tool. Previously I built a motorized router table.
As you may recognize, I shamelessly copied two other Lumberjocks JohnZ and TomT. In fact both John and Tom were kind enough to answer questions for me. Also Tom sent me some great bearings to use and John milled some threaded rods and aluminum plugs for the transport rollers.
The unit is full height. It has casters, but won’t be moved very often. I am lucky enough to have a large shop this was possible. A couple of changes from John and Tom 26” width of sanding surface, and I put the chain drive inside the lower base to keep it out of the sawdust. When I made up my mind to build a drum sander, I knew I wanted one big enough to handle glued up table top sections. The 26” came about from the size of the transport belt – 25×60.
Structurally the material is Hem Fir and MDF. The transport bed is the bed from a treadmill I got off of Craig’s list for $25. I intended to use the motor also, but it was belt driven and the belt was too short to work. I tried to get the belt pulley off to use a gear, but was not successful. So I visited my surplus store and picked up the geared motor you see in the picture. It is a 90rpm, but I geared it down to be about 56rpm. The drum is made like the Shop Notes article mentioned by John. That is many circles of MDF glued up and then sanded smooth – Final diameter is 5” +-. The motor is a 1 1/2 HP I again got off of Craig’s List. It is a 3450rpm, so I used a 2 1/2’ pulley to a 5” pulley, bringing the rpm down to 1725. For the sanding belt, I ordered the conversion kit from Jet for their 24” sander. Since their drums are 6” and mine is 5”, the kit worked almost perfectly. Had about ½ left to trim off of the end of the drum (the drum itself is 28” in order to give me a clear 26” sand area).
The result – It works very well. I am fine tuning it. Right now I have it to within .007” from side to side. The transport motor may be a little under powered so I may try to gear it down a little more.
Thanks for looking.
-- George, Parker Colorado