Jig for planing planks?

[Pitts2112]

What are people using out there as a jig to hold planks for edge planing tapers?  I've been using a straight edge and Exacto knife flat on my workbench but I find the wood moves during the slice and I haven't figured out a good way to hold plank and straight edge in place.  Photos below show my tapering tools.  I use the glued-together-planks as a base to keep the straight edge at the same height as the plank surface which helps.

 

So, I'd like to try planing instead because I think I can get more accurate and consistent tapers.  But the only vice I have is a heavy bench vice and I'm using two blocks of oak as the clamping surfaces.  It works but it's  a bugger to line everything up since I haven't figured out how to secure any one component to another and moving the vice jaws is very cumbersome.

Edited Monday at 07:57 PM by Pitts2112

[Toolmaker]

You likely know this but your support piece (the glued together planks) needs to be measurably thinner than the plank you are cutting. If not when you exert downward pressure with your fingers you will be potentially clamping on the support piece rather than the plank you want to cut. 
I cut my planks like you but I don’t use a packing piece. I also tend to make 4 or 5 lighter cuts rather than trying to cut it through in one go. This helps preventing any movement.  I then finish with a sanding stick.
 

[ERS Rich]

Put that plane upside down in a vice, mark the line on a plank, hold the plank with thumb and middle finger to keep the plank perpendicular to the blade, run the plank past the blade, with the first finger applying downward pressure and remove waste. 
 

Or hold left hand thumb middle and forefinger on the plane body, before the blade, use right hand to pull plank across blade.

 

Be careful, good luck, see my Constitution build log for more info.

 

-Rich

[grsjax]

I think this has been mentioned here before but I will go ahead and mention it again.  At least a few companies sell a fixture to hold a model by the keel to make it easier to work on.

This one is sold by Mantua.  They work really well for trimming planks.

[iMustBeCrazy]

2 hours ago, Pitts2112 said:

I've been using a straight edge and Exacto knife flat on my workbench but I find the wood moves during the slice

I would continue as you are but glue some 400 grit sandpaper to the back of the ruler and use several light cuts.

[SkiBee]

I to use a Xacto and steel rule, but I do draw a line first witch gives a little indent, then I use the back edge of the Xacto to deepen the indent once or twice then cut.  I'm going to try the sandpaper on the rule since it seems to slip a lot.

[TannumIan]

I use a homemade jig that clamps the bottom 2.5mm of the plank.  This is was a pain to use until I added the springs to open the clamp.

 

 

To shape a plank I use the miniature Veritas Block Plane.  This plane has become one of my used tools.

 

And I am currently making a vice that uses the miniature Veritas Bench Vice.

[Pitts2112]

Wow!  So many good answers!  it had never occurred to me to fix the plane and move the wood but it's obvious now that I've heard of it.  I've got several ideas to try out now.  Thanks everyone for the help!

[Y.T.]

5 hours ago, grsjax said:

I think this has been mentioned here before but I will go ahead and mention it again.  At least a few companies sell a fixture to hold a model by the keel to make it easier to work on.

This seems to be a brilliant idea.