Nusky/Mercer 0-4-0 driver width?
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- Posts: 567
- Joined: Wed Jan 07, 2004 8:04 am
- Location: Princeton, NJ
Nusky/Mercer 0-4-0 driver width?
Hi all,
I'm building a 0-4-0 camelback. The drawing for the drivers shows 2 different dimension for the tire width, depending on gauge. For 7.25(which is what I am building) shows an overall width of .875". For 7.5 gauge it shows the IBLS recc width of .750".
Anyone know why its like this? Only thing I can think of is it would allow so extra room to run the 7.25 version on 7.5 track.
Thanks,
Paul
I'm building a 0-4-0 camelback. The drawing for the drivers shows 2 different dimension for the tire width, depending on gauge. For 7.25(which is what I am building) shows an overall width of .875". For 7.5 gauge it shows the IBLS recc width of .750".
Anyone know why its like this? Only thing I can think of is it would allow so extra room to run the 7.25 version on 7.5 track.
Thanks,
Paul
Re: Nusky/Mercer 0-4-0 driver width?
Is the narrower driver on the wider guage to help prevent having to move side rods, valve gear or perhaps cylinder outboard? Or in other words having a narrower driver causes the flanges to be further apart by default.
Scotty
Scotty
Re: Nusky/Mercer 0-4-0 driver width?
Hi Paul,
Looking at the two drive wheel views, the top one is for the 7-1/4" gauge version which has the wider tread at 11/16" and a flat back.
Comparing to the next drive wheel view for the 7-1/2" gauge version, has a 9/16" tread. NOTE that this wheel has a 1/8 boss on the backside. This simply moves the flange out for the wider 7-1/2" gauge. Thus the axles can be made the same for both gauges for that design.
In my opinion, I prefer the wider treads also for the 7-1/2" versions. To do that, turn the wheels like the 7-1/4" drawing and then lengthen the axles by 1/8" on each end, keeping the 1" length thru the wheel. The 'revised' cylinder castings (Mercer now offered by IHS) offer more meat at the mounting face so that they can be machined with the extra 1/8" distance. Older builds may have used a 1/8" spacer. A thrust washer can be introduced between the drive wheel and the journal box.
Hope this helps.
Looking at the two drive wheel views, the top one is for the 7-1/4" gauge version which has the wider tread at 11/16" and a flat back.
Comparing to the next drive wheel view for the 7-1/2" gauge version, has a 9/16" tread. NOTE that this wheel has a 1/8 boss on the backside. This simply moves the flange out for the wider 7-1/2" gauge. Thus the axles can be made the same for both gauges for that design.
In my opinion, I prefer the wider treads also for the 7-1/2" versions. To do that, turn the wheels like the 7-1/4" drawing and then lengthen the axles by 1/8" on each end, keeping the 1" length thru the wheel. The 'revised' cylinder castings (Mercer now offered by IHS) offer more meat at the mounting face so that they can be machined with the extra 1/8" distance. Older builds may have used a 1/8" spacer. A thrust washer can be introduced between the drive wheel and the journal box.
Hope this helps.
Best Steaming,
Ed Archer
Iron Horse Supply Corp.
www.ironhorsesupplycorp.com
ihsc775@gmail.com
ed.archer@ironhorsesupplycorp.com
Camelback #1173, 7-1/2" gauge, propane (a Leo M.'s build)
E6 #462 Atlantic (Saturated Steam), coal
3.2 scale 040 Vulcan 7-1/2 gauge, coal
12 ton 1936 040 Vulcan 2ft gauge, oil
"One with weak mind...Has strong legs"
Ed Archer
Iron Horse Supply Corp.
www.ironhorsesupplycorp.com
ihsc775@gmail.com
ed.archer@ironhorsesupplycorp.com
Camelback #1173, 7-1/2" gauge, propane (a Leo M.'s build)
E6 #462 Atlantic (Saturated Steam), coal
3.2 scale 040 Vulcan 7-1/2 gauge, coal
12 ton 1936 040 Vulcan 2ft gauge, oil
"One with weak mind...Has strong legs"
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- Posts: 567
- Joined: Wed Jan 07, 2004 8:04 am
- Location: Princeton, NJ
Re: Nusky/Mercer 0-4-0 driver width?
Thanks for the info Ed. I'm almost ready to make the drivers so this is good info.
Re: Nusky/Mercer 0-4-0 driver width?
Hooray! Another A5a joins the fleet!
"Always stopping my train, and risking my ankles, with American made, New Balance sneakers."
Re: Nusky/Mercer 0-4-0 driver width?
Watch the clearance between the crosshead and the crankpin on the lead driver. Pretty close clearance there.
Dan Watson
Chattanooga, TN
Chattanooga, TN
Re: Nusky/Mercer 0-4-0 driver width?
Hi John,
Do not have a web site yet but is on the list to do's.
Send a note to ihsc775@gmail.com and can reply with a price list showing what is currently available on the A5a.
Do not have a web site yet but is on the list to do's.
Send a note to ihsc775@gmail.com and can reply with a price list showing what is currently available on the A5a.
Best Steaming,
Ed Archer
Iron Horse Supply Corp.
www.ironhorsesupplycorp.com
ihsc775@gmail.com
ed.archer@ironhorsesupplycorp.com
Camelback #1173, 7-1/2" gauge, propane (a Leo M.'s build)
E6 #462 Atlantic (Saturated Steam), coal
3.2 scale 040 Vulcan 7-1/2 gauge, coal
12 ton 1936 040 Vulcan 2ft gauge, oil
"One with weak mind...Has strong legs"
Ed Archer
Iron Horse Supply Corp.
www.ironhorsesupplycorp.com
ihsc775@gmail.com
ed.archer@ironhorsesupplycorp.com
Camelback #1173, 7-1/2" gauge, propane (a Leo M.'s build)
E6 #462 Atlantic (Saturated Steam), coal
3.2 scale 040 Vulcan 7-1/2 gauge, coal
12 ton 1936 040 Vulcan 2ft gauge, oil
"One with weak mind...Has strong legs"
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- Posts: 567
- Joined: Wed Jan 07, 2004 8:04 am
- Location: Princeton, NJ
Re: Nusky/Mercer 0-4-0 driver width?
Thanks for all the responses guys!
Re: Nusky/Mercer 0-4-0 driver width?
Yes, but looking at the drawings, the dimensions do not stack up correctly. 1/8 th step on wheels, and axle dimensions only add up to 7.0 back to back on the drivers....for 7 1/2 gauge the back to back should be 7 1/8 th
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- Posts: 567
- Joined: Wed Jan 07, 2004 8:04 am
- Location: Princeton, NJ
Re: Nusky/Mercer 0-4-0 driver width?
Need to look at this as my axle is in the lathe right now!
- Bill Shields
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Re: Nusky/Mercer 0-4-0 driver width?
Yes. There are errors in the original drawings
Check everything. Assume nothing
Check everything. Assume nothing
Too many things going on to bother listing them.