[cordell]

Hello, could anyone tell me how to get 13 tpi on my factory harbor freight 8x12, or how to figure out the gearing.

[HeritageAmps]

Hello, could anyone tell me how to get 13 tpi on my factory harbor freight 8x12, or how to figure out the gearing.

I'd made up a spread sheet for mine. 12.96TPI is about as close as I could get to 13. This is theoretical only, I haven't actually tried it, so I don't know if the gears will actually fit in this configuration.

Gear A = 40
Gear B = 80
Gear C = 75
Gear D = 90
Gear E = 100
Gear F = 45

Unless you need better precision, that should work ok...

[cordell]

I'd made up a spread sheet for mine. 12.96TPI is about as close as I could get to 13. This is theoretical only, I haven't actually tried it, so I don't know if the gears will actually fit in this configuration.

Gear A = 40
Gear B = 80
Gear C = 75
Gear D = 90
Gear E = 100
Gear F = 45

Unless you need better precision, that should work ok...

thanks for the reply, the gears will not align in this config, bummer!

[bodysnatcher]

i jhave every configuration but 13 hmmmm sorry

[TroyO]

Copied from another forum... credit to Richard Kleinhenz at the Lathemaster Yahoo group. I get a feeling if you walk down the list you will evetually hit one that works in reality as well as just by the numbers.
__________________________________________________ ___________
Here are some gear combinations that cut 13 TPI with a very small error. These are B-C-D-E-F defined the same as on the lathe's chart

45 66 60 68 72
45 66 72 68 60
45 68 60 66 72
45 68 72 66 60
60 66 72 68 45
60 66 72 68 45
60 68 72 66 45
72 66 90 68 30
72 68 90 66 30
35 50 75 80 66
45 60 70 80 66
60 80 35 40 66
60 80 66 40 35
66 80 35 40 60
66 80 60 40 35
66 80 70 40 30
66 80 70 60 45
66 80 70 40 30
66 80 70 60 45
66 80 75 50 35
66 80 90 60 35
70 80 66 40 30
70 80 66 60 45
70 80 66 40 30
70 80 66 60 45
75 80 66 50 35
70 66 70 60 35
70 66 70 60 35
50 66 100 70 40
50 66 100 70 40
50 70 100 66 40
50 70 100 66 40

[HeritageAmps]

actually the top 5 or 6 are the closest, then then next bunch (7 or 8) then the rest.

use this formula: 12/((40/B)*(C/D)*(E/F)) the first batch comout to 12.96, then next 12.95, and the last 12.92. close enough...

Copied from another forum... credit to Richard Kleinhenz at the Lathemaster Yahoo group. I get a feeling if you walk down the list you will evetually hit one that works in reality as well as just by the numbers.
__________________________________________________ ___________
Here are some gear combinations that cut 13 TPI with a very small error. These are B-C-D-E-F defined the same as on the lathe's chart

45 66 60 68 72
45 66 72 68 60
45 68 60 66 72
45 68 72 66 60
60 66 72 68 45
60 66 72 68 45
60 68 72 66 45
72 66 90 68 30
72 68 90 66 30
35 50 75 80 66
45 60 70 80 66
60 80 35 40 66
60 80 66 40 35
66 80 35 40 60
66 80 60 40 35
66 80 70 40 30
66 80 70 60 45
66 80 70 40 30
66 80 70 60 45
66 80 75 50 35
66 80 90 60 35
70 80 66 40 30
70 80 66 60 45
70 80 66 40 30
70 80 66 60 45
75 80 66 50 35
70 66 70 60 35
70 66 70 60 35
50 66 100 70 40
50 66 100 70 40
50 70 100 66 40
50 70 100 66 40

[cordell]

thank guys, for the help, its really appreciated, be sure to give bodysnatcher a copy, he has " every configuration but thirteen"