RCCrawler Forums

RD400 · 06-08-2005, 11:11 PM

I got a hold of a dewalt 18v drill gear case, and I just need to know what pitch the pinoin is. I want to use it as a trans in my next truck. :? :?
the model # is dw995, thanks.

ILoveRCRockCrawlin · 06-09-2005, 07:10 PM

i think your on your own

Davkin · 06-09-2005, 11:52 PM

Do you actually have the gears on hand? If so you can use a simple formula to figure it out. All standard gears had a pitch diameter, (the centerline of where the teeth should mesh.) that is equal to the number of teeth divided by the diametral pitch, (or just pitch). For example, a 48 tooth, 32 pitch gear has a pitch diameter of 1.5". To get the outside diameter of a spur gear, (more correctly known as the follower.) you add 1 to the number of teeth then divide by the diametral pitch. To work it backwards to figure what a gear is you already have measure the outside diameter, then multiply but the pitch you think it is and subtract 1, that should give you a number equal to the number o teeth on the gear, if it doesn't then try another pitch. It the pitch isn't 32 or 48 you're pretty much out of luck finding R/C pinions that will work with the Dewalt gear. It's quite possible if not likely the gears are 24 pitch.

David

Ace · 06-10-2005, 07:42 AM

Davkin has it but it's add 2 teeth not 1.

The method works really well on big gears but small pinions sometimes have trouble.

If it's really small tooth count, it's hard to measure the actual diameter because the teeth don't "line up" for your micrometer/caliper.

But, use what he said and compare results to standard pitches, but if the standard (12 20 24 32) don't seem to work, then be sure and check against metric module pitches.

I won't even mention pressure angles...

4XADICT · 06-14-2005, 03:42 AM

I have one here in my hand and it`s 32P (15t motor pinion). I had one given to me some time back and took it apart, 750 size motor 32P pinion and the lowest gear setting is roughly 10:1 (by counting turns). Hope this helps.

If not exactly 32P then very close as it meshes pretty well with a Maxx spur gear, not perfectly but very very close.

JasonInAugusta · 06-14-2005, 04:52 PM

Quote:

Originally Posted by Ace

I won't even mention pressure angles...

06-08-2005, 11:11 PM	#1
RD400 Rock Crawler Join Date: May 2005 Location: omaha Posts: 858	stupid question about a dewalt gears I got a hold of a dewalt 18v drill gear case, and I just need to know what pitch the pinoin is. I want to use it as a trans in my next truck. :? :? the model # is dw995, thanks.

06-14-2005, 03:42 AM	#5
4XADICT Quarry Creeper Join Date: Mar 2004 Location: VA Posts: 475	I have one here in my hand and it`s 32P (15t motor pinion). I had one given to me some time back and took it apart, 750 size motor 32P pinion and the lowest gear setting is roughly 10:1 (by counting turns). Hope this helps. If not exactly 32P then very close as it meshes pretty well with a Maxx spur gear, not perfectly but very very close. Last edited by 4XADICT; 06-14-2005 at 03:49 AM.

06-09-2005, 07:10 PM	#2
ILoveRCRockCrawlin RCC Addict Join Date: Dec 2004 Location: Central NY Posts: 1,980	i think your on your own

06-09-2005, 11:52 PM	#3
Davkin Pebble Pounder Join Date: Mar 2005 Location: Utah Posts: 156	Do you actually have the gears on hand? If so you can use a simple formula to figure it out. All standard gears had a pitch diameter, (the centerline of where the teeth should mesh.) that is equal to the number of teeth divided by the diametral pitch, (or just pitch). For example, a 48 tooth, 32 pitch gear has a pitch diameter of 1.5". To get the outside diameter of a spur gear, (more correctly known as the follower.) you add 1 to the number of teeth then divide by the diametral pitch. To work it backwards to figure what a gear is you already have measure the outside diameter, then multiply but the pitch you think it is and subtract 1, that should give you a number equal to the number o teeth on the gear, if it doesn't then try another pitch. It the pitch isn't 32 or 48 you're pretty much out of luck finding R/C pinions that will work with the Dewalt gear. It's quite possible if not likely the gears are 24 pitch. David

06-10-2005, 07:42 AM	#4
Ace Rock Crawler Join Date: Apr 2004 Location: Longmont, CO Posts: 901	Davkin has it but it's add 2 teeth not 1. The method works really well on big gears but small pinions sometimes have trouble. If it's really small tooth count, it's hard to measure the actual diameter because the teeth don't "line up" for your micrometer/caliper. But, use what he said and compare results to standard pitches, but if the standard (12 20 24 32) don't seem to work, then be sure and check against metric module pitches. I won't even mention pressure angles...

Sponsored Links

RCCrawler Forums

Thread: stupid question about a dewalt gears