saw teeth - Vallorbe files in use

[bugbear]

I recently (essentially to refresh my memory on this saw sharpening lark, so I know whereof I speak) sharpened a cheap 13 TPI "Cockerill" (second line saw from Spear & Jackson) saw for a friend.

http://nika.frontier.iarc.uaf.edu/~cswi ... 23#message

The profile was 13 degree rake, 15 degree fleam, and I used the 5" extra slim Vallorbe file. Without further ado:
http://www.wdynamic.com/galoots/4images ... ge_id=2792
http://www.wdynamic.com/galoots/4images ... ge_id=2793

If anyone has any tips on photographing saw teeth, I'm all ears, BTW.

My concerns about the gullet size appear justified - I certainly wouldn't want to file smaller teeth with gullets this big.

BugBear

 

[ydb1md]

How did it cut?

 

[MikeW]

Hi BB,

I cut teeth in with a 6" slim [might be a 6" x-slim] as the corners hold up better and I can push harder without failure on the edges--goes faster.

The pic below is your teeth on top and mine below. This is one I cut in last night for a joinery saw into new steel. About 12 ppi, so the scale may be a tad off from yours, but not for trying. As it is being cut in, it is a rip profile.

As I ended up shooting it at a slight angle, the far edge of the gullet and shadow can be seen, which makes the gullet appear a little larger than it is, but not much.

This will end up being sharpened with a 4" XX. The gullets will be much smaller.

When I get back from the trip, I'll cut in and "sharpen" with each of the files I have and label the pic. That will be a better look at the gullet sizes.

Take care, Mike
*edited for lousy grammar. Can't even blame it on my keyboard

 

[bugbear]

Nice information Mike, especially the tip about doing early stages in major work with larger, longer files.

Sadly, APTC don't even sell double extra slim files... ! The search for UK sources continues.

Your gullets (so far) look comparable to what I got - don't forget that fleam enlarges gullet profile as viewed straight on, and I was using 15 degere fleam,

BugBear

 

[ydb1md]

*edited for lousy grammar. Can't even blame it on my keyboard

G&T's?

 

[MikeW]

*edited for lousy grammar. Can't even blame it on my keyboard

G&T's?

Can't even say that. More a mixing of positive and negative statements.

BB, I'll get around to taking a piece of waste steel, cutting in with each file size I have and then labeling each for a better comparitive. Maybe one of each, rip and crosscut, side by side.

btw, on really tiny teeth [greater than 20 ppi] I have been known to use 3 square needle files [Grobet] and rolling the file on the last two strokes to produce a tiny gullet as the file brings the tooth to the proper rake. Tricky, but on 22-26 ppi it works with the last two strokes.

But it should be mentioned that on such thin steel [.015] a rip tooth is all it gets. No set. File from both sides and the burr is enough for clearance.

Good luck on the file hunt. Alteratively, if all else fails, I can mail you some.

Take care, Mike

 

[bugbear]

Darn. In an attempt to get smaller gullets for small teeth, I ordered one of these from APTC

(Swiss 3 square needle file)

http://www.axminster.co.uk/name/needle/ ... -22530.htm

It's a very nice file, fine teeth, and double cut.

But its arrises AKA gullet creating corners are bigger than the 4" and 5" extra slim Vallorbe saw sharpening files I already have.

It's a nice needle file though.

BugBear