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I recently purchased a Groz #4 smoothing plane. I flattened the sole and did some work
honing the chip breaker to ensure no gap between the back of the blade and the leading
edge of the breaker. It worked pretty well but I had some problem with chattering.

Next, I replaced the blade with a Hock replacement. This blade is thicker than the original
and the chattering is reduced.

I am considering (planning?) to replace the chip breaker with a thicker Hock replacement. Should
I expect much improvement from this? If so, would it be a further reduction in chatter?

Currently, I have the frog open pretty wide so that the blade is supported all the way down
to the sole. With the thicker chip breaker would it be good to close up the frog a bit more
(perhaps to 1/16")?

Tom
 

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From what I have read, you get the most bang for your buck in replacing the chipbreaker - it is much thicker than the original. You get improvement, though less, from replacing the iron - assuming of course that both irons are properly heat treated and sharpened, while the hock will be thicker than standard, proportionally you get a bigger increase in rigidity from the chip breaker upgrade. Go for the chipbreaker. I don't think the opening makes all that much difference, until you are talking about really small openings - in the .005 range of so. So stay with the position that gives the iron the most support.
 

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Have you tried closing the gap in the mouth of the sole? You generally want this area as small as possible.

Did you sharpen the blade? Even the Hock blade can benefit from a little sharpening before use.
 

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Discussion Starter · #4 ·
Thanks for the information. I have decided to get the chipbreaker. I will let you know how things work out.

Spiffpeters: I first tried the Hock blade as is but later I honed it myself. It was sharp to begin with but the
honing did improve things considerably. You suggested that I try closing the gap in the mouth of the sole.
I assume you mean by adjusting the frog forward? In that case the blade will not be supported all the way
to the sole. This is the disadvantage. What is the advantage of moving it forward? Less tearout when going
against the grain? Thanks.

Tom
 

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Discussion Starter · #5 ·
The new chipbreaker is working well. It seems to limit the chattering a bit more. I am very happy with my
very cheap plane with the new blade and chipbreaker. Thanks all for the advice.

Tom
 

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Discussion Starter · #7 ·
Hi Barry. I saw a similar amount of improvement when I began using the new chip breaker
with the new blade. I haven't tried the new chip breaker with the old blade. If I get the
time, I will try that and report back.

Tom
 
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