Railroad Warehouse 2.8.2 Mikado Logger Build

Where users can chronicle their builds. Start one thread and continue to add on to it.

Moderator: Harold_V

User avatar
NP317
Posts: 4557
Joined: Tue Jun 24, 2014 2:57 pm
Location: Northern Oregon, USA

Re: Railroad Warehouse 2.8.2 Mikado Logger Build

Post by NP317 »

Odyknuck wrote: Thu Mar 23, 2023 11:34 am The 2 bolt is my preface for reasons mentioned. Russ, it appears I will need to extend the boss on the inside of the crank to add the additional bolt. Do you see any clearance issues doing so?
Russ, it appears an 1/8" needs removed from the right side of the relief.
Two bolt clamp should work if more material is left on the "inside" of the crank for that bolt.

I do not understand your reference to "...1/8" needs to be removed from the..."
What part, where? Pictures, drawings always clarify.
RussN
Odyknuck
Posts: 813
Joined: Mon Aug 08, 2022 4:21 pm
Location: Chardon, Ohio

Re: Railroad Warehouse 2.8.2 Mikado Logger Build

Post by Odyknuck »

The length of the crank has a radius cutout in it. It appears to be more for weight reduction more than any clearance. The 1.19 value would become 1.315
Attachments
CrankArmTop_rotated.jpg
CrankArmTop_rotated.jpg (76.54 KiB) Viewed 897 times
CrankArmside_rotated.jpg
CrankArmside_rotated.jpg (81.06 KiB) Viewed 897 times
Last edited by rmac on Fri Mar 24, 2023 9:21 am, edited 1 time in total.
Reason: Photo Orientation, Enhancement
User avatar
NP317
Posts: 4557
Joined: Tue Jun 24, 2014 2:57 pm
Location: Northern Oregon, USA

Re: Railroad Warehouse 2.8.2 Mikado Logger Build

Post by NP317 »

Since the milled recess is to the outside and not "clearing" anything, I see no reason that would not work as desired.
Go for it.

When I built my loco valve gear I used the single high strength bolt to clamp the return crank to the main crank pin.
After getting the valve timing all adjusted, I then drilled the holes though the crank and main pin,
and lightly pressed in the locking bolts and added locking nuts. The single bolts easily held the crank in position during adjustments.
RussN
Odyknuck
Posts: 813
Joined: Mon Aug 08, 2022 4:21 pm
Location: Chardon, Ohio

Re: Railroad Warehouse 2.8.2 Mikado Logger Build

Post by Odyknuck »

The plans call for 6-32 bolt. I would think 8-32 would be a better choice.
User avatar
NP317
Posts: 4557
Joined: Tue Jun 24, 2014 2:57 pm
Location: Northern Oregon, USA

Re: Railroad Warehouse 2.8.2 Mikado Logger Build

Post by NP317 »

If you use Allen hex head high strength bolts with a nut on the end, like I used, #6s should work just fine.
RussN
Odyknuck
Posts: 813
Joined: Mon Aug 08, 2022 4:21 pm
Location: Chardon, Ohio

Re: Railroad Warehouse 2.8.2 Mikado Logger Build

Post by Odyknuck »

Buddy had a rush Job so no parts for me today. Awhile back I made an exhaust diverter and the design required the bottom plug and top nipple to hold it in place. Unfortunately it would be a PITA to get it aligned after the Pilot truck and Equalizer bar are installed. so I decide it needed to be mounted in the Cross permanently. so I drilled and tapped 2 4-40 cap screws in the bottom plug. Had to remove some brass from the plug to make room for the screws.
Attachments
ExhaustDiverterPlugClearanceing.jpg
ExhaustDiverterPlugClearanceing.jpg (197.43 KiB) Viewed 862 times
ExhaustDiverterTapCentering.jpg
ExhaustDiverterTapCentering.jpg (281.06 KiB) Viewed 862 times
ExhaustDiveterTapping.jpg
ExhaustDiveterTapping.jpg (325.56 KiB) Viewed 862 times
ExhaustInstalled.jpg
ExhaustInstalled.jpg (350.13 KiB) Viewed 862 times
ExhaustNippleBolted.jpg
ExhaustNippleBolted.jpg (232.41 KiB) Viewed 862 times
User avatar
NP317
Posts: 4557
Joined: Tue Jun 24, 2014 2:57 pm
Location: Northern Oregon, USA

Re: Railroad Warehouse 2.8.2 Mikado Logger Build

Post by NP317 »

Looks like a good result.
"Your exhaust may vary..." :lol:
RussN
Odyknuck
Posts: 813
Joined: Mon Aug 08, 2022 4:21 pm
Location: Chardon, Ohio

Re: Railroad Warehouse 2.8.2 Mikado Logger Build

Post by Odyknuck »

"Your exhaust may vary...", now that's funny! I believe it will work just fine.
Odyknuck
Posts: 813
Joined: Mon Aug 08, 2022 4:21 pm
Location: Chardon, Ohio

Re: Railroad Warehouse 2.8.2 Mikado Logger Build

Post by Odyknuck »

last Saturday was spent making the Return Cranks. Not sure what happened however to my surprise the mounting holes were cut undersized. So, I had to set them up on the mill and sized them with a boring bar. I am undecided on how I want to surface Finish these valve gear parts however I did glass bead the Cranks that gave them a satin finish and I kind of like it.
Attachments
ReturnCrank303BarStock.jpg
ReturnCrank303BarStock.jpg (133.97 KiB) Viewed 698 times
ReturnCrankclampHoles.jpg
ReturnCrankclampHoles.jpg (51.23 KiB) Viewed 698 times
ReturnCrankProfile.jpg
ReturnCrankProfile.jpg (120.32 KiB) Viewed 698 times
returnCrank2.jpg
returnCrank2.jpg (130.83 KiB) Viewed 698 times
ReturnCrank1.jpg
ReturnCrank1.jpg (101.92 KiB) Viewed 698 times
Odyknuck
Posts: 813
Joined: Mon Aug 08, 2022 4:21 pm
Location: Chardon, Ohio

Re: Railroad Warehouse 2.8.2 Mikado Logger Build

Post by Odyknuck »

Finally got back to completing the Piston rods. The piston rods were originally threaded into the crossheads with a taper however on the remake I went with RussN's recommendation of all threaded with a lock nut for adjustment. I did not feel a need to make new shafts, so I simply threaded the existing ones. They already had a 3/8" x 24 thread on them so it was just a matter of sizing them to .375 1.125" long and run a die down them. I use a piece of brass sheet to act as a soft jaw so not to mar the surface. It went well.
Attachments
PistonsSoftJaws.jpg
PistonsSoftJaws.jpg (129.18 KiB) Viewed 594 times
PistonShaftTurning.jpg
PistonShaftTurning.jpg (86.81 KiB) Viewed 594 times
PistonShaftThreading.jpg
PistonShaftThreading.jpg (116.25 KiB) Viewed 594 times
pistoncrosslide.jpg
pistoncrosslide.jpg (113.34 KiB) Viewed 594 times
PistonShaftLockNut.jpg
PistonShaftLockNut.jpg (65.67 KiB) Viewed 594 times
Pistons complete.jpg
Pistons complete.jpg (130.88 KiB) Viewed 594 times
User avatar
Bill Shields
Posts: 10460
Joined: Fri Dec 21, 2007 4:57 am
Location: 39.367, -75.765
Contact:

Re: Railroad Warehouse 2.8.2 Mikado Logger Build

Post by Bill Shields »

Hope your threads are nice and square.
Too many things going on to bother listing them.
Odyknuck
Posts: 813
Joined: Mon Aug 08, 2022 4:21 pm
Location: Chardon, Ohio

Re: Railroad Warehouse 2.8.2 Mikado Logger Build

Post by Odyknuck »

Me too. They are as square as the existing threads on the shafts. I ran out of time today to check for runout on the cross slides. In anticipation of them not being square, I have material to make new shafts. I will have them done on a CNC lathe at my buddy's shop.
Post Reply