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topic: 3370How to Mill 00 FB Switch Rails?
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posted: 8 Jan 2019 21:25

from:

Martin Carew
 
 

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I am currently trying to figure out the best way to file / sand / mill code Flat Bottom 82 switch rails and Google is not bringing up very good information! I may be getting too hung up on the accuracy and maths perhaps?
I have gathered up the various planning lengths required for each of the 4 switch sizes that I am using and calculated their angles based on a foot size of 1.86 being reduced to 0.93 (50%) as follows:


AV: PL=28.74mm Planing Angle 1.853°
BV: PL=38.96mm Planing Angle 1.367°
CV: PL=48.74mm Planing Angle 1.093°
DV: PL=58.54mm Planing Angle 0.91°

I have plenty of files to hand
I have a benchtop disc sander (180 grit disc at the moment)
As I am a British Expat based in Calgary, Canada, I have tried a jig from hand laid tracks but it is simply too short.

Now I have taken some rail in an attempt to make a CV blade, marked out 48.74 with a sharpie. What do I do now? Those angles are so small to do accurately by eye.

Wondering if I can find a way to adapt JFS's jig for FB here?
Point Blade Filing Jigs

Last edited on 8 Jan 2019 21:49 by Martin Carew
posted: 24 May 2019 22:31

from:

Andy Reichert
 
 

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My Proto:87 SIG Stores (USA) has FB points pre-milled.

Andy


posted: 12 Oct 2019 11:09

from:

ikcdab
 
Taunton - United Kingdom

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i wonder if you have solved this yet. I also wonder if you are trying to be too precise.My approach is to cut two lengths of rail over size.
with a permanent marker, colour the side and length to be planed...this avoids making two blades of the same hand and avoids planing too long.
fix the embryo blade to a piece of metal (i use square section aluminium) with a clamp at the waste end.
Then using a reasonable file (needle files are no good at this stage) file off the permanent marker, tapering from nothing to knife edge at the end. I do this by eye, checking with a steel rule that i have it even.
once done, release the blade and bend it so that the tapered side is straight. I then use fine wet and dry to take any rough edges and get it true.
Turn the rail over and file off the head, leaving the foot. I do use a needle file for this.
Using code 75 rail, i can make a pair in about 10 mins.


posted: 16 Oct 2019 05:47

from:

Andy Reichert
 
 

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ikcdab wrote:
i wonder if you have solved this yet. I also wonder if you are trying to be too precise.My approach is to cut two lengths of rail over size.
with a permanent marker, colour the side and length to be planed...this avoids making two blades of the same hand and avoids planing too long.
fix the embryo blade to a piece of metal (i use square section aluminium) with a clamp at the waste end.
Then using a reasonable file (needle files are no good at this stage) file off the permanent marker, tapering from nothing to knife edge at the end. I do this by eye, checking with a steel rule that i have it even.
once done, release the blade and bend it so that the tapered side is straight. I then use fine wet and dry to take any rough edges and get it true.
Turn the rail over and file off the head, leaving the foot. I do use a needle file for this.
Using code 75 rail, i can make a pair in about 10 mins.

That doesn't sound as though you filed the undercut. The point has three separately tapered cuts. Back (to stock rail side), Front (Rail head) and an Angled Undercut (to accommodate the stock rail foot).

Andy



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