Under the post 'Spokeshave Challenge' I came up with an additional plate for the SVM45 so that it could hold small spokeshave blades and also use the SE76 so that better control and square alignment can be achieved.
However when I still had another two problems. Another spokeshave blade would not fit into the SVM45 (or my modified version) due to the small lugs between the faces of the jig. Another blade I have a problem sharpening is one from a Veritas Scraper plane. This blade is 73mm (2 7/8") wide and 100mm (4") from front to back. It has a tapered shape at the back end. It has to sharpened at 45 degree. Whilst this can be achieved by clamping it in the SE76, it does not use the registration face of the SE76 due to the shape, and has to extend well out in order to make the 45 degree bevel..
So tonight's effort is shown below where I have the basis of a jig which will cope with a wide range of blades and fits into the SE76. I have made this from acrylic sheet (which is pretty strong as the company I got it from uses it as protection over stained glass windows).
I have a top and bottom plate as shown in the first photo which also shows both the blades (so will cover a wide range in between).
I have used a line of screws and nuts down each side to that the plates will not cockle and pressure can be applied over the depth of the blade.
The following photo shows the spokeshave blade set up for 25 degree bevel and grinding towards the edge.
The next two photos show the scraper plane blade set for 45 degree bevel and grinding away from the edge.
Countersunk screws were used and as the screw heads do not protrude below the bottom face of the plate this could be used with Herman's HK50 or the Tormek SVD110. The red line was applied so that I could eyeball the blade alignment.
It was too late to try it in anger, that's the weekend's job. I think it is strong enough to use without flexing being an issue. It would benefit from a grid or some blade alignment marks so that registration with the jig edge and subsequently into the SE76 all correspond. Using the marker pen method on the bevel would soon show up the alignment. The scraper plane blade is a big thing, so if you had smaller blades then you would make your jig somewhat smaller than this one. However I can cover all sizes now and my fingers will appreciate that!