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| sbwhart:
Chris Andy as made a good point, did you use a backing plate the extra thickness and support may stop that effect, also it may be an optical illusion, but the teeth look thinner than the gap they should be about the same, have you measured them ?. Did you start with the largest wheel, that way if you get a scrapper you can reduce its dia down to the next smallest and not waist the material. (you may end up with lots and lots of tiny wheels :lol:) Just a leg pull Have fun Stew |
| raynerd:
Hi Guys I`ve just been with someone who has cut out some wheels and using 2.5mm combo brass which this is, you really shouldn`t need any support or backing plate. I`m not going against your advice and theory, it sounds totally likely but with this thickness of brass it seems unlikely that the teeth will bend. In my first attempt the brass was very thin and with thin brass in future wheels I will definately back them. However, I can understand how backing plate will support the teeth from pushing backwards but not bending to the right. The advice is to take the cut in one pass at full depth. It was quite a quick clean cut and I can`t see much pressure pushing the teeth sideways, I would expect it all to be against the cut. Stew, the gaps are a touch wider than the teeth but I`ve been told that I should get away with this with lantern pinions. I think it may be worth making a lantern pinion and depthing the two out to see if I get a correct meshing? Chris |
| Stilldrillin:
--- Quote from: craynerd on December 01, 2009, 03:26:16 PM ---I`m really pleased. I`m going to re-do it as I still feel the teeth are a touch spiral which indicated my cutter was not centre. I spent a good 10 minutes eyeballing this centre with a dead centre in the rotary table and locking the Z-axis to position. I`m certain it was centre so I need to work out what was wrong, perhaps the cutter is not sitting parallel? Chris --- End quote --- Chris, It looks to me as though your cutter was below centre height. Try my setting method, used over very many years........ http://madmodder.net/index.php?topic=1904.msg22777#msg22777 David D |
| raynerd:
David, call me thick but I`m not 100% sure I`ve got the method right. What do you mean by "take a light cut across the blank, at the rear of the indexer. Rotate blank 180 degrees. Then take a same depth, but partial length cut across the blank, at the front of the indexer." Will you end with marks on the blank? I can kind of understand what your doing, your taking a cut then shifting it 180 deg and if it is not on centre you`ll end with two marks rather than one mark on the same position right? I`m just not 100% sure of your method.... any more ideas. Chris |
| dsquire:
Chris I think he means to flip the blank 180 degrees then take a partial cut to see if they line up. Cheers :beer: Don Reason for edit: Wrong advise given. Don |
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