Need small gear 3D printed.

Did you try NWSL first, to see if they stock it or can make it for you ?

Shapeways is an option for custom 3D printing that you could contract.

I assume MTH did not have the part.

Who’s NWSL? The part is not available thru MTH.

Mike

NWSL, click on Gear Request

I wore out the gears in my Lionel N&W Class A. NWSL custom made some for me and they work great.

Scott Smith

Sent in a request. Well see what happens.

Mike

I have a gear app in Rhino 6 but I dont know what a 12mm Diameter 17T 4.5mm Bore aprox 48 pitch gear is??

It’s 12mm across teeth. The center hole is 4.5mm. It has 17 teeth. The pitch of the teeth is somewhere in the 48 to 56 range. I have no way to measure exactly. I’ve only been able to do a comparison of other similar gears at an RC car shop.

that gear has 17 teeth the hole is 4.5 mm  how thick?

a picture of your gear would be helpful

Also check Stock Drive Parts. Before Mike Reagan had brass gears made for the Lionel Niagara I found gears there.

http://www.sdp-si.com/products...r-Gears-48-Pitch.php

ID is less important as long as its the same or smaller as you can always bore it to the right dimension.

Pete

I sent a request to SDP. l attached the diagram that is here.

the program app asks for

1. number of teeth  17

2. gear module <1> seems to be pre-set at 1 when I set to 0.5 the gear is too small

3. Pressure angle <20> I don'tknow what this is

4. Output pitch circle <no>

problem I have is that I switched from Mech.Engr. to Structural Engr. before I had any significant gearing classes!!

I looked up Pressure Angle, but I'm not sure how you'd determine it.  I suspect you can make an educated guess and it would work, there's no load on the gear to speak of.  I'd get it made in brass, you don't have to go back for another one.

https://en.wikipedia.org/wiki/Pressure_angle

The gear for this loco is most likely a metric gear. There is an app on line into which you put the measurements (OD, number of teeth), and it will calculate what gear style it is. Most likely a 'Mod 0.5' or something like that.

https://www.technobotsonline.c...size-calculator.html

I would recommend against 3d printing the gear, the precision is not there, and the materials are generally not that tough. The NorthWest Short line gears will be in brass or steel and well polished and should fit your application. Owner is struggling with wife's cancer right now, so tough to get a rapid response. They make good stuff.

Jim

When I plugged in those dimensions (you need an accurate OD measurement), I get something slightly larger than Mod 0.6, or 40 pitch (which is a rare bird - Ives used these a long time ago)

Jim

Mod 0.6 isn’t quite right. I’m guessing it’s  mod0.5. 

I matched it at  hobby store with a mod 0.6. Which I purchased anyway.

I would recommend against 3d printing the gear, the precision is not there, and the materials are generally not that tough. 

Not true for my printer, maybe the ones you have used. The precision of my 3D laser printer is XYZ 25 microns; that degree of precision is not too shabby. Also my printer prints materials that are isotropic so its pretty darn tough to break.

ALANRAIL. Would you be interested in having a try at the gear? I could mail it to you. I'd just need a price quote.

Mike

Mike, the actual gear measurement was 0.475 inches (or 12.065 mm).  When I use the gear calculator suggested by Jim Waterman, using 12.065mm and 17 teeth, I get a whole number for DP of 40.000 which would suggest an Imperial Gear.