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murrayec

Walker Diesel Class F - ECMbuild in 4mm for OOn3

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Hi all

Well still waiting for the bogie parts, but in the mean time I got the second bonnet up and running and also started on some of the small detail bits

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Exhaust pipe components- aluminium tube with soldered brass mounting brackets

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A bit of moulding done to create the bonnet headlamp bodies- the trusty Model T van was used, a nice set of lamps on the front, did not want to wreck the part so I did a mould around the lights still on the radiator grill! it worked

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two lamp bodies drilled to take little LEDs

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Ladders, other exhaust n brackets, the horns, and the side bonnet radiator water filler caps- all brass

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I'm thinking of making up my own motor chassis for this project, but unfortunately I cannot show a sketch, today my workshop PC decided to melt one of its drives and the walker directory was in that sector, fortunately I could back up most of the drive and thankfully I had done a system backup last month, unfortunately the edit to the drawing with the chassis design was only last week and it did not get saved in that backup, and again- fortunately Windows has a secret directory that backups get saved, even incremental! I got almost all the data back from here and it needs a few hours drawing and I'm back to last weeks version...... Backups guys, is very important

anyway, brass etched bogie with Mashima motor on top n pulley drive all hung off a PCB chassis plate, I've setup a drawing of the bogie frames to make a mould, this includes connection rods & crank counter weights to be etched in brass- i'll make contact again on supply of these parts and then make a decision.....

Eoin

 

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So you thought I'd forgotten the Walker!

No word back from the supplier on bogie parts since March?? so I decided to fabricate my own- based on the rubber band drive idea I'm working on for the N 141.....

The drawing was completed for the bogie frames, bogie bolsters, motor system, fuel tanks, bogie sides, cranks, and crank counter weights- all to be cnc cut from .3mm NS sheet;-

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A close up of the parts, all the cutting worked out fine with a 1mm end mill and the half cut done with an 45deg engraving tool for the fold lines;-762512870_WD-39IMAG4120.jpg.3698b7e1e6cdd8fc36993acce4318c72.jpg

The chassis plate was cut out of .7mm PCB board with engraved lines to position the fuel tanks and bogie bolsters when soldering on, one of those D shapes will be pressed out for the motor pulley drive to go through to drive the bogie ;-

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All the parts removed from the sheet and on the right is the motor bogie frame cleaned up and about to be folded, soldered and wheeled- though need to make a few long axles as we have outside cranks. There are 110 parts to make up the wheeled motor bogie with side-frame details, I have only cut out parts for one set of side-frames, if all goes together OK! I will be making moulds from these for casting white metal sides;-

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So a bit of processing over the week end........

Eoin

 

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Posted (edited)

Hi Eoin

There is a good reason why you haven't heard back from Malcolm Savage, he is no long with us he died about three or four months ago I think.

The good news is that some one is thinking about taking over his range, so hopefully it won't be too long before his bits become available again.

 

Regards

Colin

I must get on with my own Class F loco model at some point.

 

Edited by Colin R

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Hi Colin R

That's sad to hear,

I thought something was wrong all right, I got no reply from my follow-up emails... so left him alone.

Eoin

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13 hours ago, Colin R said:

Hi Eoin

There is a good reason why you haven't heard back from Malcolm Savage, he is no long with us he died about three or four months ago I think.

The good news is that some one is thinking about taking over his range, so hopefully it won't be too long before his bits become available again.

 

Regards

Colin

I must get on with my own Class F loco model at some point.

 

JASUS.........

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I have been working on the bogoies over the last few days, the cnc half cut folding lines in the parts were not deep enough and this caused a few problems folding and getting things straight! Here are a few photos of progress;-

Axles and drive shaft were cut and sized from 1.5mm piano wire, and a pair of chassis jigs were made to get the crank weights and rods to line up.1593961763_WD-42IMAG4124.jpg.188d858fe2fb74ef1c4f2c01f3466759.jpg

Folding, jigging, and soldering up both bogie frames required some fettling as mentioned above, but eventually they came together.

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This is the motor bogie with it's running parts, the axles are sleeved with brass tube to bring them up to 2mm dia for the Tenshodo gear set.

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and this is the first test assembly, everything worked out OK, except for the gear meshing- it's just a tad loose and will need a bit of adjustment, I reckon it will run but there is a chance the plastic gears could be stripped so I will de-solder the drive shaft bearings and adjust the holes to get it just right. It's a nice little unit and I'm looking forward to giving it a test run.....

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Eoin

 

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1 hour ago, murrayec said:

so I will de-solder the drive shaft bearings and adjust the holes to get it just right

Eoin,

 

Consider changing to larger gears on the axles?  Problem I had with the 495 was the kit came with a 23 tooth gear rather than the 20 tooth needed - difference in diameter was c. 1 mm but too large to fit the gearbox I had.   

Might be enough to pick up the slack - re-cutting the chassis and moving the bearings up will be pain!!

 

Ken

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4 hours ago, murrayec said:

I have been working on the bogoies over the last few days, the cnc half cut folding lines in the parts were not deep enough and this caused a few problems folding and getting things straight! Here are a few photos of progress;-

Axles and drive shaft were cut and sized from 1.5mm piano wire, and a pair of chassis jigs were made to get the crank weights and rods to line up.1593961763_WD-42IMAG4124.jpg.188d858fe2fb74ef1c4f2c01f3466759.jpg

Folding, jigging, and soldering up both bogie frames required some fettling as mentioned above, but eventually they came together.

2887500_WD-43IMAG4128.jpg.598eb933031d661cda64c03df930d95f.jpg

1858314749_WD-44IMAG4129.jpg.a223469f4ea8665941ddaff6ec7b8175.jpg

This is the motor bogie with it's running parts, the axles are sleeved with brass tube to bring them up to 2mm dia for the Tenshodo gear set.

66091067_WD-45IMAG4131.jpg.49304c2538bc03c8644ddfa3b09e32ba.jpg

and this is the first test assembly, everything worked out OK, except for the gear meshing- it's just a tad loose and will need a bit of adjustment, I reckon it will run but there is a chance the plastic gears could be stripped so I will de-solder the drive shaft bearings and adjust the holes to get it just right. It's a nice little unit and I'm looking forward to giving it a test run.....

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Eoin

 

Branchlines produced a 17:1 Miniature gearbox kit with 1.5mm input & 2mm output shaft which may be an option of you cannot get the gear set to work.

The business no longer has an active web presence but continues to trade through the magazines and at UK exhibitions.

PO Box 4293,  Westbury, Wiltshire  BA13 9AA

Telephone: 01373 822231

The Branchlines gear box is fully enclosed moulded in nylon with brass worm and nylon gear wheel, so meshing should not be an issue.

I bought a pair several years ago to re-build the chassis on a County Donegal railcar

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I built one of the bogie frame sides as a test of the cut-out parts, some mods will be required as things did not work out as expected from the drawing, mainly allowing tolerance for the fold lines- the drawing will be adjusted!

This is the main frame, horn blocks, spring hanger brackets and sand box folded up ready for soldering.

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All soldered, the hornblocks have worked out a bit fat, because of the reverse fold line, I calculated the tolerance for the bend the wrong way round! The sand box has a little 4mm scale steel valve rivet soldered in for the cap, and the leaf springs cleaned up ready for soldering.

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Leaf springs soldered on, a 1mm brass tube is soldered to the end of the springs to create the bracket connection to the hanger rods, these rods are removable to install the lower coil springs- thats next...

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One can see the hornblocks protrude out beyond the springs and the lower bracket, they should be flush with the spring! I will complete out the other side and assemble the frames on the bogie and see how these work out, it will push out the crank weights n rods a little bit but it may not be a problem with the overall appearance.

Eoin

 

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Springs On!

Made up little .4mm NS coil springs for the suspension on the bogie sides. Lying a bit sideways at the moment!1292634542_WD-53IMAG4153.jpg.de16c792646460fdf01191142a861486.jpg

These are the components for the bogie front with the guard iron brackets and chain hooks. 1726283332_WD-54IMAG4147.jpg.274639c1d2fd0f832a7fa24809430cfd.jpg

Fitted up and ready for soldering, three .4mm NS wire bars will be soldered across the brackets.17999432_WD-55IMAG4148.jpg.3e1458c5a35a7d36ac34db02fc089a63.jpg

and now that a set of sides are complete it's time to test fit to the bogie??2092602771_WD-56IMAG4157.jpg.421b319111eea098843d75755edf5cc1.jpg

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As suspected earlier, the hornblocks stick out further than intended and the pre-cut axles stick out only a smidge- not enough to get the crank weights on, the weights are .6mm laminates which means the axles need another 1.2mm. New axles will have to be cut, or, but its time to decide to proceed on this way or go back to cutting revised parts. There are other other issues that new cut parts would resolve...

It's a cute little mechanism though and loads of fun doing!

Eoin

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Walker chassis bits.

Some of the underframe parts were cleaned up and prepared for soldering- two diesel tanks and one set of bogie bolsters.1738955483_WD-59IMAG4179.jpg.c84685f097cf093ce3a69f4a99d6a265.jpg

This is the holding set-up for soldering the bolster parts together, there is a 1.5mm hole through the base parts, a 1.5mm aluminium rod is inserted to keep alignment and the clamp fingers hold it all together- leaving the hands free to do the soldering.1348141243_WD-60IMAG4180.jpg.415fdb01ca687c76a6caab9f5476adfd.jpg  

The motor bogie drive shaft bearings were adjusted to improve the gear meshing to the axles, this was done by broaching out the holes after the bearings were removed, it needed about .3mm adjustment and the bearings were soldered back in- good mesh now. A top-hat axle bearing is soldered on the top of the bogie for pivot fixing to the chassis plate, the motor will hold the bogie in place?

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Underframe parts cleaned up and sat on chassis plate, the cut lines provide positioning and the parts will be eventually soldered on.1451540613_WD-62IMAG4185.jpg.1ea8659b3136b18cda5cf450f0ad4cc8.jpg

The chassis plate and bogies assembled and motor installed1358167883_WD-63IMAG4186.jpg.2773791b20df687106dca840fefcebc2.jpg

The motor bogie pivots nicely in place and the motor holds it together as expected! with a bit of side tilt n all. You probably noticed the chassis plate is up-side-down!

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A test run will be next on the chassis, but I have to hold off as the axle gears have to be glued on and I'm not at the final axle length stage- I've made some mods to the bogie side frames so new parts need to be cut first.

Eoin

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