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Building a milling machine |
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NormanV:
I need some advice, I hope that someone can help. I intend taking the drive belt to the spindle on this machine above the horizontal tube that carries the head and motor. The head can be adjusted vertically, it does not have a quill as in a pillar drill but moves on a vee slide. What I was proposing to do is mount a fixed pulley at the top of the spindle and the belt will be driven from an idler pulley mounted on a splined shaft. Do you think that the idler pulley will follow the pulley on the main spindle and automatically align itself? Here is a sketch showing what I wish to achieve, any comments would be appreciated. Norman |
Manxmodder:
Hi Norm, looking at your drawing it may work if the pulley sheaves are a fair bit larger in diameter than the belt track diameter,otherwise I think it may try to shed the belt of the edge of the pulleys as they get momentarily misaligned. Maybe you could rig up a rigid arm from the top of the head and extending to the pulley on the splined power shaft. On the end of the arm nearest the splined pulley you could have a guide fork arrangement with a couple of bronze thrust slippers bearing on the top and bottom bosses of the spline pulley,this should keep the 2 pulleys in better alignment with each other rather than just relying on the belt....OZ. |
Arbalist:
Gosh Norman, you must have quite a stockpile of scrap alloy for all these parts! :D |
awemawson:
--- Quote from: Arbalist on May 30, 2014, 05:09:03 AM ---Gosh Norman, you must have quite a stockpile of scrap alloy for all these parts! :D --- End quote --- ... all those cars up on piles of bricks in the supermarket car park .... :lol: |
NormanV:
Oz, I had considered that idea but I haven't yet worked out a way to mount it on the head. I didn't design it with such a thing in mind and I don't really want to make a complete new one as there is a lot of work in the one I made. Arbalist and Andrew, I was very law abiding and bought approx. 60kg of aluminium from a local scrap yard. It cost me 80p/kilo which is quite dear but at least it was clean and stripped of all ferrous parts. I am down to 10kg so may need to go for some more soon. |
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