metalastic
Plastic
- Joined
- Mar 18, 2019
Hi,
First up I am NOT a qualified machinist so please forgive my ignorance. I have an repair that to me anyway seems achievable.
I have two double spur gears around 13" diameter on the large gear and 7" on the small gear. There were originally "as cast steel" with minimal clean up. So the tolerances are very generous.
I want to build up the smaller gear and re-machine it as it is very badly worn, but can't use a Hob or Gear cutter as both gears are cast as one so the shoulder of the large gear will prevent this.
So the way I see it is that it could be re-cut on a CNC multi axis mill or possibly on a large shaper with a dividing head (which I have). Maybe a specialized gear generator? Now the thing is I wanted to build up the teeth myself, but a few firms I approached said that was not an option for them, and wanted to make gearing from scratch.I think they are worried about destroying expensive tooling on the weld build-up which is fair enough.
I am on a tight budget so I want to keep my costs low and if I can do it myself so much the better, so I was wondering if there was such a thing as a shaper form tool for largish DP gear form? tooth depth around 1.5" - 2" I could have a go at grinding one but if such a beast exists off the shelf that would be ideal.
Maybe some of you may have other thoughts?
Cheers
Ian
First up I am NOT a qualified machinist so please forgive my ignorance. I have an repair that to me anyway seems achievable.
I have two double spur gears around 13" diameter on the large gear and 7" on the small gear. There were originally "as cast steel" with minimal clean up. So the tolerances are very generous.
I want to build up the smaller gear and re-machine it as it is very badly worn, but can't use a Hob or Gear cutter as both gears are cast as one so the shoulder of the large gear will prevent this.
So the way I see it is that it could be re-cut on a CNC multi axis mill or possibly on a large shaper with a dividing head (which I have). Maybe a specialized gear generator? Now the thing is I wanted to build up the teeth myself, but a few firms I approached said that was not an option for them, and wanted to make gearing from scratch.I think they are worried about destroying expensive tooling on the weld build-up which is fair enough.
I am on a tight budget so I want to keep my costs low and if I can do it myself so much the better, so I was wondering if there was such a thing as a shaper form tool for largish DP gear form? tooth depth around 1.5" - 2" I could have a go at grinding one but if such a beast exists off the shelf that would be ideal.
Maybe some of you may have other thoughts?
Cheers
Ian