- Joined
- Nov 16, 2012
- Messages
- 5,596
So, here's how I'll make a gear. Haven't made too many and usually try to purchase them but, what the heck...
The gear is for a lathe attachment and needs to be driven off the rack gear under the ways. First I'll grind a HSS bit to fit the profile of the tooth. Trial and error at the grinder... It finally looks like it's fitting.
![Grind Bit.JPG Grind Bit.JPG](https://www.hobby-machinist.com/data/attachments/22/22158-f3eba4bfa9a64e90c7a8bf50c493f4b1.jpg)
Next is to make a test piece. I measured 10 teeth on the rack gear and it appears to be spacing of 0.250". Seems odd because this is an Asian lathe and I was expecting a metric number. Anyhow, the test piece is a flat piece of metal and the quill was dropped 1/4" and a couple teeth were cut. The feed is slow and you need to push a little in the X direction then run the Y direction to form the tooth.
![Test Piece.JPG Test Piece.JPG](https://www.hobby-machinist.com/data/attachments/22/22159-c177eb3ad91d1b98fc46fc2a9b0cd983.jpg)
...And here's a check. Close but I'll grind the bit a little more and get it to match perfectly. BTW: the very first tooth I cut has a sharp tooth because it's not a full tooth. It's the second tooth on the test piece that I'm paying attention to as it's the first fully formed tooth.
![Tooth Check.JPG Tooth Check.JPG](https://www.hobby-machinist.com/data/attachments/22/22160-e798a1bcdcf2a48ed118df802b00ae22.jpg)
OK... We'll do more later this evening maybe... We should start calling this "Saturday with Ray"... I need a break and the dog needs a walk.
Ray
![Tooth Check.JPG Tooth Check.JPG](https://www.hobby-machinist.com/data/attachments/22/22160-e798a1bcdcf2a48ed118df802b00ae22.jpg)
The gear is for a lathe attachment and needs to be driven off the rack gear under the ways. First I'll grind a HSS bit to fit the profile of the tooth. Trial and error at the grinder... It finally looks like it's fitting.
![Grind Bit.JPG Grind Bit.JPG](https://www.hobby-machinist.com/data/attachments/22/22158-f3eba4bfa9a64e90c7a8bf50c493f4b1.jpg)
Next is to make a test piece. I measured 10 teeth on the rack gear and it appears to be spacing of 0.250". Seems odd because this is an Asian lathe and I was expecting a metric number. Anyhow, the test piece is a flat piece of metal and the quill was dropped 1/4" and a couple teeth were cut. The feed is slow and you need to push a little in the X direction then run the Y direction to form the tooth.
![Test Piece.JPG Test Piece.JPG](https://www.hobby-machinist.com/data/attachments/22/22159-c177eb3ad91d1b98fc46fc2a9b0cd983.jpg)
...And here's a check. Close but I'll grind the bit a little more and get it to match perfectly. BTW: the very first tooth I cut has a sharp tooth because it's not a full tooth. It's the second tooth on the test piece that I'm paying attention to as it's the first fully formed tooth.
![Tooth Check.JPG Tooth Check.JPG](https://www.hobby-machinist.com/data/attachments/22/22160-e798a1bcdcf2a48ed118df802b00ae22.jpg)
OK... We'll do more later this evening maybe... We should start calling this "Saturday with Ray"... I need a break and the dog needs a walk.
Ray
![Grind Bit.JPG Grind Bit.JPG](https://www.hobby-machinist.com/data/attachments/22/22158-f3eba4bfa9a64e90c7a8bf50c493f4b1.jpg)
![Test Piece.JPG Test Piece.JPG](https://www.hobby-machinist.com/data/attachments/22/22159-c177eb3ad91d1b98fc46fc2a9b0cd983.jpg)
![Tooth Check.JPG Tooth Check.JPG](https://www.hobby-machinist.com/data/attachments/22/22160-e798a1bcdcf2a48ed118df802b00ae22.jpg)