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Thread: Your latest project
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22nd Mar 2015, 08:52 PM #1426
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22nd Mar 2015, 09:31 PM #1427Philomath in training
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22nd Mar 2015, 10:16 PM #1428Golden Member
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Attachment 342789
Wow Michael that is a great job. Cutting a helical gear is a whole new ball game to cutting an ordinary spur gear. I have been trying to collect the various kit for doing this. Have just got a universal dividing head with all the attachments for spiral milling. As I have never cut one do you want to start a new thread and describe the process of cutting a helical gear. The pre machining calculations required and setup you used. I recently brought a copy of Milling machine treatise by Brown and Sharp which has a good chapter on this.
Would love to hear your thoughts.
Mark
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22nd Mar 2015, 10:27 PM #1429Most Valued Member
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Not bad but with the correct mill and dividing head and gearing a basic operation .nothing to get overly excited about unless not much excites you.
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22nd Mar 2015, 11:51 PM #1430Most Valued Member
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23rd Mar 2015, 12:09 AM #1431Diamond Member
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I'm not sure of Michael's background, or exactly what machinery he has available to him, but I gather from this comment that he made in an earlier post that he may not have done fitting and turning as a trade.
Well, for that matter, I never cease to amaze me with what I am capable of. Jobs like this do toss up interesting challenges. I still make unforced errors at times but learn enough from them to know how to do better next time. I used to think that my machining skills were on par with those of a new apprentice. Perhaps I've finally made it to second year...
Well done Michael, both the job and dealing with your neighbour with dignity and good will.
Rob
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23rd Mar 2015, 05:35 AM #1432Most Valued Member
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Great job Michael, and I am a qualified fitter and machinist that didn't leave the trade.
Just so you know, if there was a dislike button I would hold my finger on it for about an hour for Peters post.
One off helical gears measured from a damaged part have never been a basic operation.
Just sayin'
Phil
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23rd Mar 2015, 07:16 AM #1433Philomath in training
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Thanks for all the positive comments guys. I'll try and do a "make a helical gear" show and tell one day but it's a bit like a shaper, in that still photos don't do it justice.
You may do things like this all the time in your day job, but as Rob has picked up, I haven't got trade training and so for me one of the challenges is working out how to do things. I don't post everything I do but just things that I think might catch the imagination of others and (hopefully) inspire them to try things that might otherwise look daunting to them. It looks like I have met that goal from some of the comments made.
When I first joined this forum it seemed there were always people posting pics of what they had done, either fixing machines or items they have made. Others invariably offered encouragement and sometimes alternatives to methods that were also interesting. I really liked that because again it showed what was possible as well as revealing techniques. The posting doesn't seem to happen as much these days but I live in hope.
In this particular case when I first got them some years ago the lathe and dividing head both required significant repair before they would even function (the mill required repair but was functional). In this the age of CNC, I'm not even sure that the equipment used would be familiar to some of the newer qualified tradespeople.
The part itself went from the lathe to mill to lathe without losing setup. It incorporates turning, helical milling and single point threading. One end has to match a small plain bearing that had worn slightly from new condition. The other is a register diameter to match a motor driven pulley so the part requires concentricity, accuracy and reasonable surface finish. The hex socket was simple but at the same time I'd never done one.
Agreed it is not overly exciting but for someone that is self-learning it represents a step forward. Perhaps you can post pictures of the things you do at work or some of your projects at home to show us what excitement looks like
Michael
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23rd Mar 2015, 07:25 AM #1434Most Valued Member
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Its typical. Its typical of another great job done by you Michael.
And, its typical for PC's sad sack attitude to life!
It's far superior than anything ive seen out of your shed PC.
SimonGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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23rd Mar 2015, 09:28 AM #1435future machinist
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Nice gear fantasic machining as usual Michale and as a third year fitter machinist apprentice I can can say that we don't cut any gears in fact we do the gear module of the course on the internet thanks government for cutting 12 weeks a year from the course.
BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE
Andre
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23rd Mar 2015, 12:05 PM #1436Most Valued Member
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I agree, helical gear cutting is an interesting challenge. Perhaps pipeclay, using his extensive experience and massive tooling collection, might deign to show us something really challenging, say a matched pair of helical gears in herringbone configuration, using prime numbers for the gears - I suggest 73 teeth for one and 127 teeth for the other.
I'd be delighted to see someone do this using all mechanical equipment, because it sure stopped *me* many years ago. I cheated.
PDW
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23rd Mar 2015, 03:26 PM #1437Most Valued Member
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23rd Mar 2015, 03:53 PM #1438
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23rd Mar 2015, 06:09 PM #1439Diamond Member
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That gear looks pretty good. I reckon the 3rd year apprentice at work would struggle making that.
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23rd Mar 2015, 07:54 PM #1440Most Valued Member
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Hi PC,
I have had a think about my post and I owe you an apology. What I said was out of line and quite harsh. If I had have walked away and thought a little more I could possibly have responded in a more constructive way. I know you have churned out many a fine piece of work and I know you are very much accomplished at what you do.
I won't deny that I found your post rather disappointing and quite deflating though. Any, enough of this. Lets look at more projects!
SimonGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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