Undercutting gears?

[sidecar bob]

Boss Engineering in Wanganui do undercutting & are fairly expierienced with bike boxes.

[roadracingoldfart]

An air grinder?......what a fooken animal.
Nothing cloudy Biggles, you need only establish three parameters:

• The amount of material removal.
• The profile of material removal.
• Method of material removal.

Do some homework bro.

I do alot of gear rework and i use a very nice little Air grinder , it spins to a max of 75,000 rpm (variable) and sits in a tool post .

The description "air grinder " im sure conjures up visions of a 1/4 inch collet piece of mahem. But my Ushio is what gear cutters use and its the same size as a felt pen but .

The best gear cutting / making is from Bettany Gears in Paraparaumu. (no im not associated)

Paul.

[SixPackBack]

I do alot of gear rework and i use a very nice little Air grinder , it spins to a max of 75,000 rpm (variable) and sits in a tool post .

The description "air grinder " im sure conjures up visions of a 1/4 inch collet piece of mahem. But my Ushio is what gear cutters use and its the same size as a felt pen but .

The best gear cutting / making is from Bettany Gears in Paraparaumu. (no im not associated)

Paul.

Are you using a tool post together with dividing head?.....do you blue the matching parts afterwards to ensure drive is evenly distributed?

[Sketchy_Racer]

Are you using a tool post together with dividing head?.....do you blue the matching parts afterwards to ensure drive is evenly distributed?

In some cases when the factory gears are in good shape from new (as in the dogs match up pretty close) I've found with a bit of patience and a pencil grinder and some bearing blue you can get a excellent match with out the use of a dividing head. I've only done it once and I probably wont do it again like that but it is possible. Same as scraping bearing surfaces, done by hand, just takes for ever if your really anal about it.

Where do you work SPB?, it sounds like you have some pretty cool machinery there.

[SixPackBack]

In some cases when the factory gears are in good shape from new (as in the dogs match up pretty close) I've found with a bit of patience and a pencil grinder and some bearing blue you can get a excellent match with out the use of a dividing head. I've only done it once and I probably wont do it again like that but it is possible. Same as scraping bearing surfaces, done by hand, just takes for ever if your really anal about it.

Where do you work SPB?, it sounds like you have some pretty cool machinery there.

I run a workshop in Albany. CNC Mill, Lathe, Wire eroder, Surface grinder, tool and cutter grinder, manual mills and lathes etc.....all the toys.
We manufacture prototype and proof of concept electric motors.
Sounds like you understand the basic principles of Precision Engineering Sketchy_Racer, you can get stellar results with the most rudimentary of equipment if you know what you're doing.

[Biggles08]

I run a workshop in Albany. CNC Mill, Lathe, Wire eroder, Surface grinder, tool and cutter grinder, manual mills and lathes etc.....all the toys.
We manufacture prototype and proof of concept electric motors.
Sounds like you understand the basic principles of Precision Engineering Sketchy_Racer, you can get stellar results with the most rudimentary of equipment if you know what you're doing.

Ahhh we're all a box of fluffy ducks now arn't we!

[roadracingoldfart]

Are you using a tool post together with dividing head?.....do you blue the matching parts afterwards to ensure drive is evenly distributed?

Ive even been known to plastiguage to measure contact lol .
yer ok im anal.

Yer either i use a divider head or just free hand , whats needed really.
I have access to a wire cutter eroder (real easy to pattern ) and spark eroder (plunge type) but i just give instructions for them , im not allowed to play with them. They are part of an alloy extrusion machine shop.
The plunger is really good for broken hardened studs , they are a bitch lol.

Glen should know all about this crap , hes more qualified than cowboys like me . He got learned the low pay way , aye Glen lol.

Paul.

[Sketchy_Racer]

Glen should know all about this crap , hes more qualified than cowboys like me . He got learned the low pay way , aye Glen lol.

Paul.

Still learning the low pay way mate! Damned apprenticeships.

I really need to get into a work shop where I will learn more though! We have some really nice gear at the one I'm at the moment, but non of the 'tradesmen' have a clue how to use it properly, and they wont let me on it. (probably due to the fact I'm an apprentice.)

Never mind, almost finished my time, and once I'm done, unless a large sum of coin is offered, I'm outta there!

[SixPackBack]

Still learning the low pay way mate! Damned apprenticeships.

I really need to get into a work shop where I will learn more though! We have some really nice gear at the one I'm at the moment, but non of the 'tradesmen' have a clue how to use it properly, and they wont let me on it. (probably due to the fact I'm an apprentice.)

Never mind, almost finished my time, and once I'm done, unless a large sum of coin is offered, I'm outta there!

WTF...you should have at least attempted to use the workshop machinery-all of it!

What apprenticeship are you completing? I have taught a few apprentices in my time and have become a qualified assessor for CompeteNZ. It sounds like you are being sold short.

[Sketchy_Racer]

WTF...you should have at least attempted to use the workshop machinery-all of it!

What apprenticeship are you completing? I have taught a few apprentices in my time and have become a qualified assessor for CompeteNZ. It sounds like you are being sold short.

I'm doing a Competenz mechanical engineering - machining strand apprenticeship. I was doing the machining - toolmaking one until they realised that the work shop I was at didn't actually do any toolmaking what so ever.

To be fair I do get to use the machines (We have 3 cnc mills and 3 cnc lathes) but apart from the one or two times I got to do tool setup, If I have been on them, it's just been green button pressing for production (yawn). I've just finished doing a 2 week block course primarily about CNC setting and programming and buggered if they will let me do any.
The only times I have done programming was when I got pissed off at something dumb (eg, a rapid point that was 100mm away from the job, so you watch it machine air for the first 100mm before it does a 10mm cut on something) and changed it without asking. All they guys running them have no qualifications.

As I say, I really need to get away from there, but it's hard to find another job to replace that one at the moment.

[SixPackBack]

I'm doing a Competenz mechanical engineering - machining strand apprenticeship. I was doing the machining - toolmaking one until they realised that the work shop I was at didn't actually do any toolmaking what so ever.

To be fair I do get to use the machines (We have 3 cnc mills and 3 cnc lathes) but apart from the one or two times I got to do tool setup, If I have been on them, it's just been green button pressing for production (yawn). I've just finished doing a 2 week block course primarily about CNC setting and programming and buggered if they will let me do any.
The only times I have done programming was when I got pissed off at something dumb (eg, a rapid point that was 100mm away from the job, so you watch it machine air for the first 100mm before it does a 10mm cut on something) and changed it without asking. All they guys running them have no qualifications.

As I say, I really need to get away from there, but it's hard to find another job to replace that one at the moment.

Hang in there. The best thing you can do is get another job when you get out of your time, you would forever be the 'apprentice' if you stayed.

Did you train at Petone Tech?...In my day all the Toolies went there for training, they had superlative facilities.

[Sketchy_Racer]

Hang in there. The best thing you can do is get another job when you get out of your time, you would forever be the 'apprentice' if you stayed.

Did you train at Petone Tech?...In my day all the Toolies went there for training, they had superlative facilities.

Nah they sent me to Auckland (Manukau Institute of Tech) for my course, the rest of my paperwork is correspondence. It was really good. (The course, not Auckland...)

[SixPackBack]

Nah they sent me to Auckland (Manukau Institute of Tech) for my course, the rest of my paperwork is correspondence. It was really good. (The course, not Auckland...)

Our apprentice came back from Manukau complaining bitterly about the courses. How did you find MIT?

[Sketchy_Racer]

What's your apprentice's name, and when did he go? I wonder if we were on the same course (they don't run them very often)

The course had many faults, the biggest one being the complete and utter lack of time to get the paperwork and the practical completed. Second to that was a lack of time on the machines, or lack of machines (people lining up for a grinder or something.)
Also, the paperwork quality is very poor. I failed 5th form english twice and feel I could do a better job on quite a lot of it. The other problem was that it looked like someone with no industry experience wrote the papers, so there were some real odd ball questions in there that shouldn't have been.

The tutors were out numbered for the amount of students, but the ones I had were very helpful, so long as you were being proactive about your work.

To be fair, I think that MIT did quite a good job, it was merely the time restrictions put on them by Competenz and the sub standard paper work by Competenz.

Obviously it's all a matter of opinion, but that is how I would sum it up.

[SixPackBack]

What's your apprentice's name, and when did he go? I wonder if we were on the same course (they don't run them very often)

The course had many faults, the biggest one being the complete and utter lack of time to get the paperwork and the practical completed. Second to that was a lack of time on the machines, or lack of machines (people lining up for a grinder or something.)
Also, the paperwork quality is very poor. I failed 5th form english twice and feel I could do a better job on quite a lot of it. The other problem was that it looked like someone with no industry experience wrote the papers, so there were some real odd ball questions in there that shouldn't have been.

The tutors were out numbered for the amount of students, but the ones I had were very helpful, so long as you were being proactive about your work.

To be fair, I think that MIT did quite a good job, it was merely the time restrictions put on them by Competenz and the sub standard paper work by Competenz.

Obviously it's all a matter of opinion, but that is how I would sum it up.

Simon.

I have a meeting with CompeteNZ this friday, its going to be a little stormy....