I'm confused about 20t Stud gear on reversing assembly.

Tojan19 · Feb 11, 2015

I'm a complete newbie to this. So please pardon my ignorance.

My SB9 started out as a model B. 1960's era. I converted it to a gear box (Model A). I know I need a 20T stud gear, and from what I understand the stud gear is the lower small one on the reversing assembly. A 16t is currently on there. So I ordered a 20t stud gear off ebay, and now I'm rather confused. I removed the 16t and the shaft is 0.562 and the 20t gear I ordered has a 5/8" bore. The 20t also has a extension that would leave me almost no threads for the nut if I stacked it on the inner gear.

Where do I go from here? What parts should I be looking for?

20t I bought on ebay.
http://www.ebay.com/itm/371246836390?_trksid=p2057872.m2749.l2648&ssPageName=STRK:MEBIDX:IT

Jasmeet singh · Feb 11, 2015

Hey!,
Can i know the diameter of the 20 teeth Gear you bought?
Is it a 16 dp gear?

Tojan19 · Feb 11, 2015

It's 1.368"

Jasmeet singh · Feb 11, 2015

well, its a 16 dp ,14 1/2 degree pressure angle spur gear!
whats the width of that gear?
do you have a lathe?
do you how to cut thread??
whats the thread(pitch)on that shaft??

iwananew10K · Feb 11, 2015

You bought a lead screw gear, not a stud gear.

Tojan19 · Feb 11, 2015

iwananew10K said:
You bought a lead screw gear, not a stud gear.

Well that explains it. Anyone got a source for a 20t stud gear? Can't seem to find any on ebay w/o buying the whole reversing assembly.

Jasmeet singh · Feb 11, 2015

I have made a quick drawing for you, you might use that gear. you will have to bore that gear a little more.

If theres any mistake, please let me know.

kitno455 · Feb 11, 2015

The gear you bought goes inside the gearbox, on the end of the leadscrew.

allan

Tojan19 · Feb 11, 2015

Jasmeet singh said:
I have made a quick drawing for you, you might use that gear. you will have to bore that gear a little more.View attachment 130271

If theres any mistake, please let me know.

Thank you. I'm going to try to find the correct gear, but I'll keep this in mind.

Jasmeet singh · Feb 11, 2015

I think that keyway will make a little problem for you...i'd too prefer you to buy a new gear,and

Your welcome.

iwananew10K · Feb 11, 2015

I have one, PM me your address and I'll send it and a few other misc. parts I found.
Thrust bearing,take up nut, and the inner reverser spindle gear. All dirty and used but serviceable.

FYI- it's a 14.5 degree, 18DP gear about .380 ish wide x 1.22" diameter

when you get it just stick 6 bucks in an envelope and mail it to me. I think that's still about the cost for small flat rate.

Jasmeet singh · Feb 11, 2015

iwananew10K said:
I have one, PM me your address and I'll send it and a few other misc. parts I found.
Thrust bearing,take up nut, and the inner reverser spindle gear. All dirty and used but serviceable.

FYI- it's a 14.5 degree, 18DP gear about .380 ish wide x 1.22" diameter

when you get it just stick 6 bucks in an envelope and mail it to me. I think that's still about the cost for small flat rate.

I think he needs 20 teeth 16 dp gear,nevermind though.

promacjoe · Feb 11, 2015

iwananew10K said:
You bought a lead screw gear, not a stud gear.

The stud gear and lead screw gear or interchangeable by design. There should be no modification needed.
in fact, you swap the 20 tooth gear for a 40 tooth gear to cut 4 tpi . both gears can be stored on the lead screw.

they are supposed to have the same shaft dimensions!.

Tojan19 · Feb 11, 2015

iwananew10K said:
I have one, PM me your address and I'll send it and a few other misc. parts I found.
Thrust bearing,take up nut, and the inner reverser spindle gear. All dirty and used but serviceable.

FYI- it's a 14.5 degree, 18DP gear about .380 ish wide x 1.22" diameter

when you get it just stick 6 bucks in an envelope and mail it to me. I think that's still about the cost for small flat rate.

That is awesome. IM sent.

Tojan19 · Feb 11, 2015

iwananew10K said:
I have one, PM me your address and I'll send it and a few other misc. parts I found.
Thrust bearing,take up nut, and the inner reverser spindle gear. All dirty and used but serviceable.

FYI- it's a 14.5 degree, 18DP gear about .380 ish wide x 1.22" diameter

when you get it just stick 6 bucks in an envelope and mail it to me. I think that's still about the cost for small flat rate.

That is awesome. IM sent.

iwananew10K · Feb 11, 2015

kitno455 said:
The gear you bought goes inside the gearbox, on the end of the leadscrew.

allan

Yes.
the "workshop" 9 and 10k end gearing is 20DP from the spindle to the reverser gears and change to 18DP at the stud gear through the rest of the train.

i should have been more specific than just leadscrew gear.

Ron_m80 · Feb 11, 2015

EDIT: I see you have an offer for one already.

iwananew10K · Feb 15, 2015

Oh, wife dropped off yesterday, should be on the way.

I'm confused about 20t Stud gear on reversing assembly.

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