I think it would be wise to diagnose your problem correctly before applying any remedy!
Typically, there are two problems that can arise when fitting 'modern', thicker blades in a Baily style plane. The first is the wrong distance from the toe end of the chipbreaker to the slot that engages the cam of the adjuster yoke. That has to be spot-on, even 1.5mm off optimal will cause trouble due to the limited arc of travel of the adjuster cam. If the distance is the same on your original CB & the new one, then the CB should not be the source of the problem.
The second common problem is that the cam can't reach far enough through the thicker blade to engage the slot in the chipbreaker properly. In extreme cases, it won't reach at all, but more commonly it just touches the edge at the full extent of its travel which isn't enough to get the blade extruded or retracted fully.
I'm somewhat confused by your various descriptions & terminologies, but it seems like you have the latter problem, or possibly a combination of both. A new yoke with a longer cam should be the solution in that case. Don't do anything to the bottom part of the yoke, i.e., the part that engages the thumbwheel, that will NOT be a cause of the problem unless someone fitted a weird yoke, which seems highly unlikely in a 1 yr old plane.
If you are fitting a thicker blade than original, you should be able to set the frog back, even to the point where the bevel of the sole is sitting a little proud of the frog. The thicker the blade, the further up the back of the blade the sharpening bevel goes, so the blade will clear the sole bevel even if it is jutting forward a bit. To what extent you can get away with this is subject to the vagaries of individual planes. Manufacturing tolerances have gone to hell in a handbasket since late last century, so I'd need to examine your particular plane before making any further judgements...
Cheers,
Ian
Yeah, I definitely have both problems. I've held up both my new LN and my new Hock CBs against the original Record and they are both 1.5-2mm closer away from the mouth end. Both my Stanley No.4 and Record No. 5 have the same distance, so LN and Hock are shorter (and shorter overall).
I've been playing with them for a while now and the mouth simply isn't big enough or the frog at the right angle to get it to work. If I move the frog back to accommodate it, the blade isn't supported. If I put it in the right position (there isn't really that much room for adjustment) then the blade touches the front of the mouth at the same time as it's starting to appear underneath (i.e. when it can cut). No room for shavings to get through, maybe for final finishes, perhaps.
Personally I suspect you will end up with a new LN blade & chip breaker and an unusable modern Record if you take a file and other tools to it to modify. I wouldn't be surprised that even if you manage to get it fitted, you will just find another reason why it's most probably a bad idea.
I'd sell the Record and get a better plane to start with. If you get one more likely to fit the LN blade then great, if not, sell the LN kit and get the alternative modern blades that will.
Yep, I'm tending to agree with you. Having examined in in good light, I can't shake the feeling that grinding the mouth won't be the end of my problems. It would be a shame to do all that work and end up with a limited range of usage. So...
Option 1: Use the longer lever and grind the mouth back 1-1.5mm and hope that's the end of it.
Option 2: Throw more money at it and get a better plane that take the LN 3mm.
I prefer option 2. This isn't isn't a bad plane, I'll just use it for less demanding work. Maybe I can find a decent 2mm A2 steel blade that fits it (it's Stanley-compatible, as far as I can tell).
It's not the blade ... it's the LN chipbreaker. The slot for the blade projection is further forward by 1/4". The LN chipbreaker will work will with LN planes, and all else is a lottery.
Try the original chipbbreaker with the blade.
I suspect that the blade is too thick anyway, even if you open the mouth - the yoke will be unlikely to reach through the slot to make adjustments. If so, get the Veritas replacement.
Regards from Perth
Derek
I tried the original CB with it, but while that looked OK, it had the same problem with the mouth being too narrow. The lever reaches better, but there's no room to adjust it to fit the mouth. I've gone back and forth with all combinations many times and it always comes down to the thicker blade hitting the front of the mouth or not being supported by the frog. I've tried sitting in back so the back mouth bevel isn't providing support, but adjusting down to cutting depth means there's a nasty gap behind the blade and it still doesn't have room for shavings to come through.
You have got 3 issues to consider
I would try the new chip breaker with the old iron to see if the slot is in the right place. If it isnt then it wont work and you will need a different chip breaker, (If you try and file it you will end up with sloppy depth adjustment and loads of backlash)
- The bade is thicker so the yoke possibly wont be long enough to engage in the cap iron
- the blade is thicker so the frog will have to move backwards. If it cant go further back you will have to file the front of teh mouth to open it uo
- The new chip breaker may have the slot for the yoke to engage in the wrong place
Try the new blade with the old cap iron, this will show if the yoke will reach (if it doesnt you need a longer yoke) and if the frog can be adjusted to accomodate the thicker blade. I would try and steer away from filing the mouth.
I have a number of planes with different combinations
If you speak to workshop heaven they have number of options. I have found the quangsheng chip breakers work for me in record planes. I would also recommend the thin laminated Tsunesaburo blades as a direct replacement with no messing around
Ian
Yep, all true! Cheers for the tip on the CB filing. I can see how that would cause both.
Ah, I hadn't seen the Tsunesaburo blades, they look good. Thanks for that, seems like a great option. That is the one I'll get for the record, I think. I'll have to find a home for the LN blade now, though. Any suggestions for a plane that will take a LN 3mm with LN CB? That isn't >£300