sleeper06 Posted April 7, 2014 Report Share Posted April 7, 2014 I USE same method , carbide cutter , but I chuck gear into rotary table Quote Link to comment Share on other sites More sharing options...
Slt250r222 Posted April 7, 2014 Author Report Share Posted April 7, 2014 It's a buddy's mill I ordered carbide end mills for it. They should be here tomorrow. The mills he had barely put a scratch in the gear. We tried a few different bits. I was told to run the mill at around 1100rpm Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted April 8, 2014 Report Share Posted April 8, 2014 ^ slow and steady saves the tool. Just keep it oiled up enough to make any Hawaiian tropic girl jealous. Quote Link to comment Share on other sites More sharing options...
RagunCajun Posted April 8, 2014 Report Share Posted April 8, 2014 keep coolant on it. But if you stay in a cut and keep coming out the coolant can shock the tool and make it brittle and brake. Although you shouldn't have a problem with that on gears. slow as in feed rate or rpm tricked? Very different things. Can you clarify for him please. Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted April 8, 2014 Report Share Posted April 8, 2014 Both. My old man was a machinist for years before moving to production supervisor. Always taught me spin the tool as slow as you can while still pulling a good cut. As for feeding, that's different for any material and cutting speed. You just gotta watch the where you're cutting and listen to the way the machine sounds. If the removal starts to wane and the machine starts to sound crazy smooth and almost speed up, give it some more material Quote Link to comment Share on other sites More sharing options...
Slt250r222 Posted April 8, 2014 Author Report Share Posted April 8, 2014 The rpm of the bit is around 1100 And we were feeding it manually very very slowly. The carbide bits will be here today but he doesn't have time tonight to try em. He did put a new cooling set up on over the weekend so it should go well this time around.Thanks everyone for the knowledge and in put. I'll keep everyone updated Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
sstaton1983 Posted April 8, 2014 Report Share Posted April 8, 2014 The rpm of the bit is around 1100 And we were feeding it manually very very slowly. The carbide bits will be here today but he doesn't have time tonight to try em. He did put a new cooling set up on over the weekend so it should go well this time around.Thanks everyone for the knowledge and in put. I'll keep everyone updated Sent from my iPhone using Tapatalk I used an air grinder with a couple different carbide bits... I took my time not to destroy the temper on the gears.I spent about 20 minuets per gear. Its done and back together. Im way to impatient to drag out the process that long.. Quote Link to comment Share on other sites More sharing options...
rubberneck Posted April 9, 2014 Report Share Posted April 9, 2014 Rotary table will make your life much easier but if you dont have it you will have to do what you have to do. I also use a carbide cutter, only the surface is really hard, id guess about .040" or so after that it machines pretty easy, just keep the coolant or oil on it and take your time. As far as reliability, this will in no way change that. The stock set up only ever has 3 dogs engaged anyway. Why yamaha even put 6 on the gear is a mystery to me. good luck 1 Quote Link to comment Share on other sites More sharing options...
camatv Posted April 10, 2014 Report Share Posted April 10, 2014 the case hardening is pretty significant. i usually break about 1-3 bits doing these here. i also use coolant and cut them vertically. after the cnc is up and running i think it will go better. a lot of "old timers" were used to cutting easily machinable materials and then heat treating them. at least the old as dirt books i have read that seems to be the case. on a side note i finally got a big rotary table here to do override drums with ye ha! also i think i am starting to like really older machinery. the way they look and the just massiveness of the way they are built is really interesting to me. the 1910 Cincinnati belt drive horizontal mill i just acquired is sweet. Quote Link to comment Share on other sites More sharing options...
Slt250r222 Posted April 10, 2014 Author Report Share Posted April 10, 2014 We wish we had a rotary table this would go a lot faster. We already broke one bit on the first gear. Were still getting the hang of it but it's goin pretty we'll today Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Slt250r222 Posted April 10, 2014 Author Report Share Posted April 10, 2014 Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Slt250r222 Posted April 10, 2014 Author Report Share Posted April 10, 2014 The carbide bits definitely don't last. Would a cobalt end mill be much better? Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Slt250r222 Posted April 10, 2014 Author Report Share Posted April 10, 2014 Well it turns out we had the speed wrong. Now it's cutting better but now I need to order more end mills lol. It's all a learning experience Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
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