Posted by BillS on March 04, 2013 at 14:03:55:

In Reply to: PFAUTER P900 DEFFERENTIAL CHANGE GEARS posted by chuck tucker on March 04, 2013 at 10:41:02:

According to the "Gear FAQ" here, the P900 could be either dial feed (hydraulic) or uses feed change gears.

If you are using CPC-HOB, the machine would be entered as type "A".

Assuming your hob is single lead, then:

gearing ratio = 0.3598808

If you don't use CPC-HOB, then you need to find a gear set that has a ratio close to the number above (as close as possible).

The FAQ topic:

Hob machine Constants and Types

will show you differential constants for different machines, and at the end of that table is a description of formulas. Your formula is based on a type "A" machine.

Based on using Diametral Pitch (DP), The __constant part__ of the formula is:

(225/8)

C = ------------- = 0.352459273

(25.4 x PI)

So your complete formula would be:

0.352459273 x SIN(Helix Angle) x DP

Gear Ratio = ----------------------------------------------- = 0.3598808

Hob Starts

There is no "absolute single gearset" for this ratio, but rather you will need a "best gearset"
based on your change gear inventory and machine mounting conditions
(swing arm, CC shafts, change gear pitch, etc).

- Re: PFAUTER P900 DEFFERENTIAL CHANGE GEARS
**Tom Ramsey***16:21:25 03/14/13*(1)- Re: PFAUTER P900 DEFFERENTIAL CHANGE GEARS
**BillS***06:45:14 03/15/13*(0)

- Re: PFAUTER P900 DEFFERENTIAL CHANGE GEARS
- Re: PFAUTER P900 DEFFERENTIAL CHANGE GEARS
**chuck tucker***15:19:31 03/04/13*(1)- Re: PFAUTER P900 DEFFERENTIAL CHANGE GEARS
**BillS***18:01:02 03/04/13*(0)

- Re: PFAUTER P900 DEFFERENTIAL CHANGE GEARS