I have been trying to find a place that manufactures a stock item with
specs similar to the following:

Pitch diameter (PD) greater than four inches but less than five inches.
Teeth inner diameter greater than four inches (I am going to cut a 4"
diameter circle out from the inside).
Number of teeth a multiple of five (preferably a multiple of fifteen),
60-75-90-105-120 are reasonable.
Thickness of 1 to 1.5 inches
Metal (steel preferred).

Mating gear(s) available with a 5:1 reduction, and preferably also 3:1.

Basically, a fairly thin cylinder of metal with teeth on the outside.
PD of 4.5 inches would be optimal.

I've tried Boston Gear, but they don't quite make what I need. Google
turns up lots of custom manufacturers that will create a nice
high-priced bespoke item, but (officially at least) don't "stock"
anything.

Does anyone know of a manufacturer which makes gears in this
approximate size range as a stock item?

Thanks,

Hairy

On 28 Mar 2006 20:54:19 -0800, wrote:

I have been trying to find a place that manufactures a stock item with
specs similar to the following:

Pitch diameter (PD) greater than four inches but less than five inches.
Teeth inner diameter greater than four inches (I am going to cut a 4"
diameter circle out from the inside).
Number of teeth a multiple of five (preferably a multiple of fifteen),
60-75-90-105-120 are reasonable.
Thickness of 1 to 1.5 inches
Metal (steel preferred).

Mating gear(s) available with a 5:1 reduction, and preferably also 3:1.

Basically, a fairly thin cylinder of metal with teeth on the outside.
PD of 4.5 inches would be optimal.

I've tried Boston Gear, but they don't quite make what I need. Google
turns up lots of custom manufacturers that will create a nice
high-priced bespoke item, but (officially at least) don't "stock"
anything.

Does anyone know of a manufacturer which makes gears in this
approximate size range as a stock item?

Thanks,

Hairy

Have you thought about looking at the guts of a standard automotive
transmission?

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Boston Gear. But they don't have what you need. What's wrong with using
two 20dp cast iron gear with 90 teeth and 14-1/2 degree pressure angle?

wrote:
I have been trying to find a place that manufactures a stock item with
specs similar to the following:

Pitch diameter (PD) greater than four inches but less than five inches.
Teeth inner diameter greater than four inches (I am going to cut a 4"
diameter circle out from the inside).
Number of teeth a multiple of five (preferably a multiple of fifteen),
60-75-90-105-120 are reasonable.
Thickness of 1 to 1.5 inches
Metal (steel preferred).

Mating gear(s) available with a 5:1 reduction, and preferably also 3:1.

Basically, a fairly thin cylinder of metal with teeth on the outside.
PD of 4.5 inches would be optimal.

I've tried Boston Gear, but they don't quite make what I need. Google
turns up lots of custom manufacturers that will create a nice
high-priced bespoke item, but (officially at least) don't "stock"
anything.

Does anyone know of a manufacturer which makes gears in this
approximate size range as a stock item?

Thanks,

Hairy

wrote:

I have been trying to find a place that manufactures a stock item with
specs similar to the following:

Pitch diameter (PD) greater than four inches but less than five inches.
Teeth inner diameter greater than four inches (I am going to cut a 4"
diameter circle out from the inside).
Number of teeth a multiple of five (preferably a multiple of fifteen),
60-75-90-105-120 are reasonable.
Thickness of 1 to 1.5 inches
Metal (steel preferred).

Mating gear(s) available with a 5:1 reduction, and preferably also 3:1.

Basically, a fairly thin cylinder of metal with teeth on the outside.
PD of 4.5 inches would be optimal.

I've tried Boston Gear, but they don't quite make what I need. Google
turns up lots of custom manufacturers that will create a nice
high-priced bespoke item, but (officially at least) don't "stock"
anything.

Does anyone know of a manufacturer which makes gears in this
approximate size range as a stock item?

Thanks,

Hairy

WM Berg has a ton of gears -- they may have something. I would be
willing to bet on the diameter, but the pitch may be finer than you want.

Have you checked the McMaster-Carr website? They do have gears, but I
don't know if they'll have what you want.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Posting from Google? See http://cfaj.freeshell.org/google/

In article .com,
says...
I have been trying to find a place that manufactures a stock item with
specs similar to the following:

Pitch diameter (PD) greater than four inches but less than five inches.
Teeth inner diameter greater than four inches (I am going to cut a 4"
diameter circle out from the inside).
Number of teeth a multiple of five (preferably a multiple of fifteen),
60-75-90-105-120 are reasonable.
Thickness of 1 to 1.5 inches
Metal (steel preferred).


If by thickness you mean the face width of the teeth, you're unlikely to
find anything off the shelf. A Martin TS1260 (12DP, 60T, 1" face) is
close with a 5.166 OD. If you can live with a 1/2" face a Martin TS2090
(20DP, 90T) meets the rest of your specs. Maybe you could stack two
together to get 1"?

Ned Simmons

On 28 Mar 2006 20:54:19 -0800,
wrote:

I have been trying to find a place that manufactures a stock item with
specs similar to the following:

Pitch diameter (PD) greater than four inches but less than five inches.
Teeth inner diameter greater than four inches (I am going to cut a 4"
diameter circle out from the inside).
Number of teeth a multiple of five (preferably a multiple of fifteen),
60-75-90-105-120 are reasonable.
Thickness of 1 to 1.5 inches
Metal (steel preferred).

Mating gear(s) available with a 5:1 reduction, and preferably also 3:1.

Basically, a fairly thin cylinder of metal with teeth on the outside.
PD of 4.5 inches would be optimal.

I've tried Boston Gear, but they don't quite make what I need. Google
turns up lots of custom manufacturers that will create a nice
high-priced bespoke item, but (officially at least) don't "stock"
anything.

Does anyone know of a manufacturer which makes gears in this
approximate size range as a stock item?

Thanks,

Hairy
==============================
FWIW

One of the first things I would do is get the exact
specifications I am looking for in terms of industrial standard
diametrical pitch/module, pressure angle, face width, tooth
count, bore diameter, etc. Material may also be a consideration.
Can you use a polymer [plastic] gear?

Next go on google, and send these specifications to the huge
number of gear suppliers asking what they have that is close that
you may be able to modify.

If you still can't find anything, it is possible to make a gear.
How good a fit does it have to be. Is this for power
transmission [how much and how fast] or positioning [required
accuracy]? Durability requirement? Volume requirements?


Unka George
(George McDuffee)

I sincerely believe . . . banking establishments are more dangerous than standing armies,
and that the principle of spending money to be paid by posterity, under the name of funding,
is but swindling futurity on a large scale.
Thomas Jefferson (1743–1826), U.S. president.
Letter, 28 May 1816, to political philosopher and Senator John Taylor

Ned Simmons wrote:
If by thickness you mean the face width of the teeth, you're unlikely to
find anything off the shelf. A Martin TS1260 (12DP, 60T, 1" face) is
close with a 5.166 OD. If you can live with a 1/2" face a Martin TS2090
(20DP, 90T) meets the rest of your specs. Maybe you could stack two
together to get 1"?

Works for me! Thanks very much. All set now.

There are so many sites that spam the search engines that they've
become pretty much useless for this sort of query. Not to mention that
"gear" is a synonym for "equipment" and even "stuff", in addition to
its more specific meaning of "roundish metal thingie with teeth".

Hope this isn't a duplicate post; my cat just walked over the keyboard
and wiped out the previous attempt at a reply.

Hairy

I had these gears for my lathe custom made for $120 total, which I
thought was a great deal:
http://users.frii.com/sos/Steve/gears.jpg

Miller Machine is the place:
http://www.millermachineandfabricati...html#southbend

Steve

wrote:

I have been trying to find a place that manufactures a stock item with
specs similar to the following:

Pitch diameter (PD) greater than four inches but less than five inches.
Teeth inner diameter greater than four inches (I am going to cut a 4"
diameter circle out from the inside).
Number of teeth a multiple of five (preferably a multiple of fifteen),
60-75-90-105-120 are reasonable.
Thickness of 1 to 1.5 inches
Metal (steel preferred).

Mating gear(s) available with a 5:1 reduction, and preferably also 3:1.

Basically, a fairly thin cylinder of metal with teeth on the outside.
PD of 4.5 inches would be optimal.

I've tried Boston Gear, but they don't quite make what I need. Google
turns up lots of custom manufacturers that will create a nice
high-priced bespoke item, but (officially at least) don't "stock"
anything.

Does anyone know of a manufacturer which makes gears in this
approximate size range as a stock item?

Thanks,

Hairy