michael mott
Western Thunderer
Hi Ian I am not sure why that is.
Michael
1/32 LMS 4-4-0 class 2P
- Thread starter michael mott
- Start date
Michael
Ian@StEnochs
Western Thunderer
Strange one Michael. I cannot see the pictures on your posts 115/6 on here, i-pad, but I can see them on my phone, a Samsung. No problems with any other threads, or your previous posts, so I am puzzled.
Ian
michael mott
Western Thunderer
Today I was able to cut out the first of the valve links these are laminated from a layer of archival Matt board with some .0085” printable cardstock on both sides.
After drilling the .020” holes for clamping bolts the two halves were cut apart with the jewelers saw the laminate was treated with AC glue at various stages to ensure that it was all plasticized. One small step at a time.
Looks like it’s going to work.
Michael
After drilling the .020” holes for clamping bolts the two halves were cut apart with the jewelers saw the laminate was treated with AC glue at various stages to ensure that it was all plasticized. One small step at a time.
Looks like it’s going to work.
Michael
michael mott
Western Thunderer
Not much work the last few days I have been nursing a very painful lower back, probably due to lifting all those heavy valve link rods.
Michael
Michael
michael mott
Western Thunderer
A little progress today, These links are very fiddly I cannot imagine doing this on a 7mm or smaller loco.
A lot of bits of card and brass rod.
Michael
A lot of bits of card and brass rod.
Michael
Roger Pound
Western Thunderer
Brilliant, Michael. If I may be permitted to paraphrase - I can't imagine being capable of such fine work 
.
Roger
.Roger
michael mott
Western Thunderer
Started on the main rods
Punched the holes first then glued the thicker parts to the big end.
After fretting out the shape the thinning down to match the crank. The big end was cut in order to fit the crank.
The pins holding it together are.028”
That’s it for today.
Michael
Punched the holes first then glued the thicker parts to the big end.
After fretting out the shape the thinning down to match the crank. The big end was cut in order to fit the crank.
The pins holding it together are.028”
That’s it for today.
Michael
michael mott
Western Thunderer
The main rods are fixed to the main axle with the fake bolts a coat of red oil paint. The valve rods are using fake bolts as well. I made some new hex stock with the draw plate pulling some 2mm brass rod down to .052” across the flats close to 1 5/8
Which equates to a 1 inch bolt
Michael
Which equates to a 1 inch bolt
Michael
michael mott
Western Thunderer
On page 18 of Wild Swan publications No3 The Class 2 superheated 4-4-0s the drawing of the lifting linkage appears to be drawn in error, I know how Stephenson valve linkage works and according to the way this is drawn the assembly cannot be altered from the central position the following two details from the diagram illustrate my point
I think that the lifting arm appears to be either too short or long from the plan it appears that the pin passes through both the bracket connected to the valve rod and the slide, the end cross section seems to confirm this. I would suggest that the lifting link is better to be attached to the bottom of the curved slide link
Then the slide can be raised and lowered with a longer arm the geometry is better than shorter. I would appreciate any feedback from the wisdom of your collective knowledge.
Michael
I think that the lifting arm appears to be either too short or long from the plan it appears that the pin passes through both the bracket connected to the valve rod and the slide, the end cross section seems to confirm this. I would suggest that the lifting link is better to be attached to the bottom of the curved slide link
Then the slide can be raised and lowered with a longer arm the geometry is better than shorter. I would appreciate any feedback from the wisdom of your collective knowledge.
Michael
adrian
Flying Squad
I don't think it is drawn in error - I think it's just unfortunate they've drawn it in mid-gear where everything aligns. I making an educated guess but I think the expansion link will be a machined casting, it will have an outer boss to which the lifting link is bolted, but the link block will slide inside this outer boss. It has a seperate pin and not connected to the outer boss.
Hopefully this shows them separate.
Very tenuous and open to interpretation but I'd suggest that the lack of the dotted line here suggests that they are separate pins and not connected.
Hopefully this shows them separate.
Very tenuous and open to interpretation but I'd suggest that the lack of the dotted line here suggests that they are separate pins and not connected.
michael mott
Western Thunderer
Thanks Adrian that is helpful it can only work if the pins are in three pieces even so the clearance is very close.
Michael
Michael
adrian
Flying Squad
Unfortunately clearances are very tight! Having fitted inside working motion to a 7mm L&Y Pug how they do it in 4mm scale is beyond me.
michael mott
Western Thunderer
Working on the cross slide bars and front of the cylinder block trying to make the visible parts have some semblance of reality I am hoping that it will all work as planned. I know that it would have been a whole lot easier to have made it all with metal. I wanted to see how far I could push my abilities with unconventional materials in this area.
First picture is of the bar’s glued together then after trimming the spacer it will be glued to the cylinder block.
The circular parts of the cylinder block are turned from some English Boxwood and the slide bars are Castillo boxwood. The first set were glued to the insides of the cylinder covers then the outer parts were glued on
I put some wedges in to squeeze the bars to the support plate then using a needle tack glued the plate to the bars. Next I dry fitted them between the frames.
Tomorrow after the pva glue has set fully I can slip it out to finish off the rest of the details and paint it up. I will use a silver sharps pen on the bars on the outside surfaces.
Time for supper.
Michael
First picture is of the bar’s glued together then after trimming the spacer it will be glued to the cylinder block.
The circular parts of the cylinder block are turned from some English Boxwood and the slide bars are Castillo boxwood. The first set were glued to the insides of the cylinder covers then the outer parts were glued on
I put some wedges in to squeeze the bars to the support plate then using a needle tack glued the plate to the bars. Next I dry fitted them between the frames.
Tomorrow after the pva glue has set fully I can slip it out to finish off the rest of the details and paint it up. I will use a silver sharps pen on the bars on the outside surfaces.Time for supper.
Michael
michael mott
Western Thunderer
Moving along after making the piston connection to the main crank in brass I swapped it out for one made from card.
Michael
Michael
michael mott
Western Thunderer
Here is a short clip of the motion so far.
michael
michael
Roger Pound
Western Thunderer
Michael,
The technicalities are way beyond my skill set, but I am happy to see that you are solving the problem with your usual patience and craftsmanship. Watching this project coming together is not only a pleasure but a true education.
My humble thanks for your publishing the progress, warts and all!
Roger.
The technicalities are way beyond my skill set, but I am happy to see that you are solving the problem with your usual patience and craftsmanship. Watching this project coming together is not only a pleasure but a true education.
My humble thanks for your publishing the progress, warts and all!
Roger.
michael mott
Western Thunderer
Thank you Roger. As Adrian has already said I am also amazed that there are some amazing skilled builders out there who are able to do this work on 7mm models. There are definitely some limitations with using non traditional materials, this would definitely be much more difficult without CA glues which allow the printed card to be plasticized and it capillaries into the white archival Matt board to make it extremely strong. Even so I have to use some metal in a couple of places for purely practical reasons. I am surprised by how much I have been able to get done with the card though.
Michael
Michael
michael mott
Western Thunderer
A slow week worrying about the next steps.
After looking at Crimson Rambler’s 0-6-0 valve gear I have been spurred on with the work. Made the oil cups first then rolled some tube out of gum strip for the lifting links.
Michael
After looking at Crimson Rambler’s 0-6-0 valve gear I have been spurred on with the work. Made the oil cups first then rolled some tube out of gum strip for the lifting links.
Michael