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| PekkaNF:
--- Quote from: NormanV on May 30, 2014, 01:01:14 PM ---The "big idea" for doing a different way round is because I have used a milling spindle for the main shaft and I cannot see how to fit a splined shaft to it and the mount for the pulley without having to remake the whole head. Yes, I should have planned it in advance but I didn't. --- End quote --- OK. I get it. I think (not sure, but I should consult my friend) that this construction might have a problem trough a belt tension putting strain on splined shaft. Also this would have a tendency to stick the pulley onto splined shaft. I think that the both problems would trivialize, if you could mount an arm to drilling head and use a bearing on the moving v-belt pulley to retain the pulley and absorb the belt tension. Probably deep grove ball bearings with pretty big clearance should be good for it. Or is there very minimal space for a arm? I hope I don't approach this at obtuse angle, it is not my intention. I like to put bearing as close to load vector as I can, because my mechanical engineering skils don't amount much to go boldly where no-one dares. Pekka |
| NormanV:
Pekka, the point you make about belt tension "sticking" the pulley onto the splined shaft is something that I hadn't thought about. I think that this could be a real stumbling block with my idea. It would not be possible to mount an arm between the two shafts as the vee slide is in the way, I will have to use 100mm pulleys to enable the belt to pass either side of this. I think that I will have to revisit the normal way of doing things. I would have to rely on the torsional strength of a 10mm thread to make it work, I will look into it more closely. Thank you for your input, I was irritated by what I perceived as sarcasm in your original response but now realise that you were trying to help. Thank you. |
| PekkaNF:
I'm really sorry about irritation I caused, English is not my first language and I have tendency to use wrong wording even when my intention is help. One more thought....I'm mot sure how much you have space there, but how about using the head design as it is and put poly-v belt on it (easy on draw bolt and such). And offset a jack shaft that is this splined shaft. Would that allow you to move the belt out of way? Pekka |
| hanermo:
I made a very rigid lathe bench for my little 7x lathe, filled with concrete. I had no shrinkage. Bench is 120 mm high mild steel, 12 mm thick, in a welded box, with crossed 15 mm rebar in center, welded to each other, 3 each of x and y crossing, in the center. I put a 200-500 kg preload in the box, by heating the rebar with propane, before welding the last end pieces in. Steel about 50 kg, total mass about 150 kg. Results about 95%. Works extremely well. A bigger 8x lathe would have been better. Cost about 250€ in materials, in Spain, 2005 or so. |
| vtsteam:
That was steel with concrete, this is aluminum-ium, um light alloy. Not alkali friendly. |
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