a quartering jig.

[victor miranda]

I was asked to fix a 2-10-0 by minitrix.

If you have not tried to reassemble one of these, you are in for a treat.
It is not all that hard...  keep the left and right sides straight and you are good to go.
it will remind you of shuffling a deck of cards with one hand.

If one gear slips or a driver ....
then you may need one of these...



I have not proven this one.
it is curing in the photo.
and I have to install the gear index point.
then the loco will be assembled.

building jigs must be my idea of fun, I keep doing it.

victor

[Lemosteam]

Victor, how many quartering jigs have you made? 

It's hard to tell from the picture- what do you use to align the two grankpin holes at 90 degrees?

I assume you need to make each axle the same, is this from gear ratio or is it jsut basic reality?

Really really nice quality by the way.  Wish I had more machining tools.

What are all the loose bits for?  I would love to see an image with the axle in place...

[victor miranda]

hi lemosteam

I think this is my third... 
it depends on how one counts major revisions.

The index for quarter is done by drilling the three holes,
axle and the two cranks, all at the same time.
It is specific to the driver.

I gave up on making a universal type.

I'll get another photo of the axle/drivers in place.

victor

[mmagliaro]

A yes, a true universal quartering jig for N Scale.... the Holy Grail of N Scale steam building tools.
I gave up on the idea too.  I give Victor a lot of credit for  building the jigs.  I gave up on that idea as well.
"By eye" will just have to do.

[victor miranda]

Lemosteam,

I tried to find a way to take a photo that would explain how it works...

the best I can do is take a photo that shows the way I constructed it.

a quartering jig is a careful drilling job more than anything else.
This one has a gear indexing clamp it is sitting on the gear in the photo.
the axle is in one of the holes and you can see the holes for the crankpins

the plate off to the left has a crankpin to set the quarter.
I expect to use a drill press to push the drives on the axles.



victor

[victor miranda]

hi Max,
I am decidedly in favor of the ole mark-I eyeball to do quartering.
it works well for smooth pressfit axles like the CC northerns.

with the minitrix axles the splines are big and corse. 
They have an annoying habit of chosing their own quartering.

I was trying to see if my camera could capture the axle stub.
those splines are the reason for the Jig.



victor

[Lemosteam]

Victor,

MAN that would have come in handy when I was positioning my Kato Mike drivers on the Minitrix axle during my Minitrix Decapod-to-L1s escapade. forum.atlasrr.com/forum/topic.asp?TOPIC_ID=68986

Man I still ahve to finish that thing!

http://flic.kr/p/bAdDL8