When you file the ends of the guide foot to taper a smooth transition for the thread do you coat the filed area with anything to protect for corrosion?

I don't.

I just wrap with thread, let two coats of CP dry and then two (or more thin) coats of epoxy.

Sam

Depends on what thread you will be using and if CP is going to be used or not. If I am not using CP and using a light colored thread, I will use some model paint like Testors to cover the foot to make it match the guide, that is when I use guides with black frames. This way you do not see the silver of the frame through the thread. For dark threads, it does not matter if you use CP or not, the guide usually will not show through.

I use a black permanent marker pen all the time.
Incidentally, I dress the guide feet with a sewing machine powered grinder which gives me the control I've always wanted.
Philip

I agree with Phillip's method.

For tye tpicaly guide I will use black permenant marker if it s black guide. If it is a chrome or gold guide I will leave it alone after prepping.

Roger

I believe thAt just coloring it with a permanent marker does not protect from corrosion.
Billy v uses someting. I just can't remember what.

Corrosion is the thing I am concerned about. If the guide is stainless and the plating is a dissimilar metal when we file the foot down we expose the two metals. If water (Saltwater) get under the epoxy as it was eventually will you will have electrolysis occur between the two metals.

Thats my point. Let me get back to you on that note.

Surely when the wrap is epoxied, there is no way any corrosion can occur? If it does then that must point to poor coverage?
Philip

Philip you may need to reconsider.

Corrosion takes many forms that contribute to part failure.

When you grind the foot of a austenitic stainless steel gude frame many things can happen that are detrimental to the life of the part.

Covering any freshly ground stainless surface with anything that contains the chloride ion will cause intergranular cracking of the part when stressed.

The aerospace and power industries know the penalty paid when incorrect procedures are performed.

Chloride free Sharpie Pens are available to color the ground surface of stainless parts without introducing things that will contrubute to early failure.

Sharpie Products provide a chloride free pen to be used when marking stainless..

If you grind a stainless guide frame, apply anything that contains very low concentrations of chloride ion the frame has a high possibility of simply cracking into when the frame is loaded.

Take a look at some of the things used:

[www.markingpendepot.com]

[www.scribd.com]



Edited 4 time(s). Last edit at 03/04/2011 11:19AM by Bill Stevens.