Check out Scott Hites web site He has a great muller page. |
The Mini Muller Project |
I like to thank all the Hobbicasters. Who have given there input hints an tips. I like to give credit where credit is do. But didn't do to good of a job of keeping track. So to all many thanks till your better payed. OldF |
Mini wheel muller |
The Mini wheel started out as a test bed With in its limits. It has work out quite well. From what I have been told, an have read. A Muller imparts a squeezing smearing action. That coats the sand grains with the clay binder, be it oil or water tempered. Some thing that's real hard to do with oil if mixed by hand. The big Mullers use heavy steel wheels on floating axles spinning in a tub At 40 to 60 rpm. Wanting to keep things simple an use off the shelf parts. I hit on the plan to use a strait axle and downward pressure on the drive shaft, In place of heavy wheels. The hub is a ¼ inch pluming tee that has been retaped For ½-inch 13 thread. This is easy to do clamp the tee in a vice an run the tap in the holes. The axles are ½ inch bolts 4 ½ inches long. The drive shaft is ½ inch all thread. |
At first I planed to use a hand drill to drive the Mini. But found that the drill would soon burn out under this kind of load. An this led me to using my drill press. The lowest speed on my drill press is 195 rpm. If try you this make sure that the bucket is centered with the Mini and well anchored to the drill press table. |
Set the bucket so that the Mini will just touch bottom when lowered with quill of the drill press Keep the batch size small 10 to 12 pounds max. More than this and you wont get good mulling action. The batches I have tried so far have came out great. I have mulled water tempered an K-Bond oil sand. |
The Mini Muller project came about to prove that a Muller for the small foundry IE a sand pile Of 100 to 200 pounds and limited shop space. Could be built using materials found at the big hard ware and Home improvement stores. Using common hand tools. If you have a shop full of nice tools and toys and a big Junk box by all means use them. Please use this file as a starting Point for building your own. I wished I had built some thing like this years ago. If nothing else the work it saves is well worth the Time it took to build. And the fact that the sand that comes out is Better than what you could do by hand is the icing on the cake. |
Check out Scott Hites web site He has a great muller page. |
