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| Building a milling machine |
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| NormanV:
I have been busy today. I gave quite a bit of thought to Pekka's comments and decided that I would be able to do it the "normal" way after all. The milling spindle has a 12mm thread (not 10mm as I originally thought) to which I can attached the splined shaft, that should be plenty strong enough to transmit enough torque for even a large fly cutter. I have made the patterns for the mounting brackets for the pulley and I think that they will do the job. The attached photo shows the patterns mounted in place to show how it would fit together. Unfortunately the weather forecast for the next couple of days is not too good so I will have to be patient. I do not plan to make the splined shaft myself and was thinking of trying to find a shaft from a gearbox that might suit as my original search found one that was priced at over £50. I searched some more today and found a supplier who can provide what I need for only £20. I shall get it ordered tomorrow. Norman |
| NormanV:
I've just had a bit of a disappointing pour. All seemed to be going well but nothing came up the riser. I assumed that the mould had collapsed and went back inside to watch the Canadian Gran Prix practice session on TV. Things got worse, Lewis Hamilton is not the top of the board! When it had cooled down I opened up the mould ant to my surprise I had a complete casting, it appeared that when I poked a rod into the sand to rap the pattern I had loosened some sand right on the exit corner and blocked it enough to stop the metal but it allowed the air to escape. There was a bit of a collapse but I think that I can clear that with a grinder. I had to have two goes at making the mould, I don't want to have to do the whole thing again. Once I've cut it back with the grinder it will do fine, plus it won't show! |
| NormanV:
Here are the four castings that I need to mount the pulley above the head of the machine. The two square pieces are for the bearings. The two main castings are too big for me to machine so I made the bearing mounts separate so that I can easily machine them and then align them accurately before fixing them in position. |
| PekkaNF:
I really wish I had courage to try casting and had even 1/4 of your skills. To me those look incredibly good. Casting really saves effort on turning/milling from solid and gives much freedom on design. Pekka |
| awemawson:
:thumbup: Looking very good Norman - you must be pleased :thumbup: I take it you've been back to the scrappy and got some more aluminium? |
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