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d.seiter@comcast.net
This probably wouldn't work due to shrinkage, but if there isn't much load on the gears, couldn't you cast a replacement with a very short fiber filled epoxy? Assuming you had a set of good gears to start with.
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-Dave -------------- Original message --------------
From: lothar baier <microwaveengineer1968@...> the gear shown on this page would be quite expensive, reason beein that this gear has two parts, the straight part is easy and can be hobbed, the other part that is slanted is not as easy, it cant be hobbed at least not on the hobber i have so the manufacturing steps would start making the blanks then using a dividing head and mill to cut the teeth on the slanted part one by one and then hob the other part a gear like this would definatlt satisfy the 5hr estimate chuck gave, performing the indexing calculations for the dividing head alone is a b.... from first look i thought that the gears are made out of PVC and not delrin, usually PVC has softeners that evaporate over the years and then the part becomes brittle and cracks so seein actually cracked gears made me think of PVC. I actually thinking about getting a 8640 Sometimes, altough its a old box it still has pretty darn good phasenoise which sometimes you needm its also very clean. The priority has just shifted a bit because i recently got a SMHU58 and this one has a phasenoise floor thats almost as good maybe even better and goes to 4GHz Metalworking to me is primarily a hobby so i dont look for financial gratification, yes normally you wouldnt make a part you can buy for $2 BUT as usual there are situations you will, one of them is when you want to make the part better, if you have a $2 gear thats made out of lousy chinese crap metal and is bound to break again in two month and you know by making one out of good high carbon steel you can have one that lasts 10years then you may think about it again, another thing is that what costs $2 today may not be available at all tomorrow ! The other reason is learning, if you want to learn certain operations or teach somebody else skills then you may not look at the pricetag or hours you spend ! Last but not least there is gratification, nothing is more gratifying then looking at something you have build with your own hands and equipment ! I deeply despise this "why do it if you can buy it cheaper" attitude, this has gotten us into the whole chinese mess to begin with ! i rather spend $50 in material and tools and know the money goes to US companies to make a gear then to spend $2 that go straight overseas supporting foreign jobs and encourage US companies to move even more jobs there ! pdxoregonpete <pdxoregonpete@...> wrote: I'm sorry this has gone this way, I just offered to buy the junker and if someone lived in Reno could pick it up strip it keep the rest of it if they wanted to, and send someone like Chuck or a retired mechanical engineer I know draw up a set of plans then give them to someone with a hobber, Then post the details on mfg.com and maybe a Chinese shop would surprise us with the cost. There's just one gear thats not a simple one, Fig 5 near the bottom of the page -pete --- In hp_agilent_equipment@..., "pdxoregonpete" <pdxoregonpete@...> wrote: __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around |
