Drill Motor Gear Specs?

[gregscott]

Does anyone know the exact specs: Pitch diameter, pitch etc. for the gear that is on the Bosch drill motor. I am trying to make a gear reduction box for it (without the planetary reduction that comes with it) and I want to get the center to center distances right, and get the correct gear to mesh with it.
Near as I can measure the pitch seems to be 7mm but if anyone knows for sure - or where to find the info - I would much appreciate it.

Thanks,

Greg

Team 709

[Bill Gold]

http://www2.usfirst.org/2003comp/Spe...inion_Gear.pdf

[gregscott]

Originally Posted by Bill Gold

http://www2.usfirst.org/2003comp/Spe...inion_Gear.pdf

Bill, thanks much. Not to be ungrateful at all, but the pdf was a little hard to read...looks like somebody scanned it. Any clue where the manufacturer's site is or if anyone has a CAD file on it?

Thanks again,

Greg

[Rob Colatutto]

firstcadlibrary has one, but they seem to be down right now.
The pinion gear is a 15 tooth, modular 7 pitch gear. Pitch Diameter is 10.5mm and the gear has a 9mm face width if you couldn't read the posted pdf.
You can find gears to mate with it from PIC http://www.pic-design.com/
Also, a nice mm to inches converter can be found here http://www.omnis.demon.co.uk/

[gregscott]

Originally Posted by Rob Colatutto

firstcadlibrary has one, but they seem to be down right now.
The pinion gear is a 15 tooth, modular 7 pitch gear. Pitch Diameter is 10.5mm and the gear has a 9mm face width if you couldn't read the posted pdf.
You can find gears to mate with it from PIC http://www.pic-design.com/
Also, a nice mm to inches converter can be found here http://www.omnis.demon.co.uk/

Thanks Rob,

Do the gears change from different years? I downloaded a drillmotor gear from FIRST CAD but it has 12 teeth...like the one on the drillmotor I'm looking at right now.

Greg

[Ed Sparks]

The motor & pinion posted on FirstCadLibrary are not from last year. I intend to post this motor & pinion very soon.

[Rob Colatutto]

Last year there was a new model bosch drill motor given in the kit. Previous years drills were from a 3/8 inch hand drill and last years were from a 1/2 inch. Every year the motors change up a little so its always good to be cautious when designing things pre-season.

[Ryan Curry]

For those that have knocked the pinion off of the drill motor:

1) Do you have any idea how much force (in tons) it took approximately? I have a 1/2ton arbor but I'm not sure whether or not it will do the trick.

2)What did you use for the punch itself?


Thanks

-Rc

[Rob Colatutto]

I would not suggest taking that pinion gear off the Bosch. Doing so just adds about 10 things that can go wrong with it. The small metric gear on it now is press fit perfectly onto the small metric shaft. You can order mod7 gears from PIC to mate with it very nicely. In all, its just much more added complexity and time to save ordering 1 mod 7 gear.

[Paul Copioli]

We took the pinion off the motor and a 1/2 ton will work fine. We used an M3 bolt as our punch. Line in up and slowly press it off .. like butter.

To place another pinion on the shaft, I suggest a 0.001" to 0.0015" press fit maximum.

-Paul

[gregscott]

Originally Posted by Rob Colatutto

I would not suggest taking that pinion gear off the Bosch. Doing so just adds about 10 things that can go wrong with it. The small metric gear on it now is press fit perfectly onto the small metric shaft. You can order mod7 gears from PIC to mate with it very nicely. In all, its just much more added complexity and time to save ordering 1 mod 7 gear.

There is a 60 tooth mod .7 gear posted on the First Cad web site. I could not find this gear...I' sure it's out there I just couldn't find it with someone who could deliver it in less than 6 weeks. I actually tried to make it on a laser cutter but there was too much heat for that small a gear...I am thinking of trying it on a water jet cutter but I would love to just buy it. I will try PIC gears but does anyone have any other ideas. Also, does anyone know the pitch circle of that 60 tooth .7 module gear?

Thanks one and all,

Greg

[Andy Baker]

Originally Posted by gregscott

Also, does anyone know the pitch circle of that 60 tooth .7 module gear?
Thanks one and all,
Greg

60 teeth x 0.7 = 42 mm pitch diameter

Good luck getting parts delivered from PIC. They have traditionally had a 3-4 week delivery for these types of gears, at best.

Andy B.

[Paul Copioli]

Baker,

They must not like you too much. I get my 0.7 module gears from them in 2 weeks. It must be the accent.

Does this violate your "Don't bother posting" rule?

-Paul

[SarahB]

Originally Posted by Ryan Curry

For those that have knocked the pinion off of the drill motor:

1) Do you have any idea how much force (in tons) it took approximately? I have a 1/2ton arbor but I'm not sure whether or not it will do the trick.

2)What did you use for the punch itself?


Thanks

-Rc

At a recent team meeting, Ryan informed us that he now plans to use a Dremel to remove the pinion from the drill motor. Does anyone have any suggestions or advice for this? I'm a little worried that this might end up damaging the motor, can anyone confirm/deny?

[Paul Copioli]

No, No, No; do NOT use a dremel. Use a press and push the gear off. Please see my post above in this thread. You could cause damage to the motor if you cut it off with a dremel.

-Paul