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purpose of a frog

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Forum topic by Karda posted 07-07-2020 03:42 AM 372 views 0 times favorited 6 replies Add to Favorites Watch
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Karda

2367 posts in 1362 days


07-07-2020 03:42 AM

hi, i am slowly learning how to use and adjust a hand plane. what does the frog do. thanks Mike


6 replies so far

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SMP

2268 posts in 714 days


#1 posted 07-07-2020 04:53 AM

Well a couple things depending on plane. Lets assume a Bailey or clone. For one it hold the iron at the bed angle. So for example on a Lie Nielsen plane you can buy frog with a 50 degree or 55 degree bed angle etc. The other is it slides forward to back which effectively can change the mouth opening and/or align it with the back of the mouth(which can add rigidity and make it less likely to “chatter”). Some have 2 screws to hold it down, and some have a 3rd screw which actually slides it forward and backward.

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KYtoolsmith

167 posts in 669 days


#2 posted 07-07-2020 11:16 AM

SMP has it exactly right, the frog allows the plane iron to be positioned close to the front of the throat or away from the throat edge depending on the needs of the work, and still hold the iron rigidly. That capability is exactly the feature Leonard Bailey patented back in 1855. Interestingly, Bailey never called that part a “Frog”. His patents call it a cutter seat and cutter holder.
... So now you know, something new to forget…
Regards, The Kentucky Toolsmith!

-- "Good enough" is just another way of saying "it could be better"...

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SMP

2268 posts in 714 days


#3 posted 07-07-2020 12:59 PM


Bailey never called that part a “Frog”. His patents call it a cutter seat and cutter holder.
... So now you know, something new to forget…

The funny part about that is I once called it a “blade” and was very quickly corrected that it was actually called an “Iron” not a “blade”, by some know it alls.

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OSU55

2651 posts in 2798 days


#4 posted 07-07-2020 01:38 PM


Bailey never called that part a “Frog”. His patents call it a cutter seat and cutter holder.
... So now you know, something new to forget…

The funny part about that is I once called it a “blade” and was very quickly corrected that it was actually called an “Iron” not a “blade”, by some know it alls.

- SMP

Yes some need to denigrate others to feel good. Iron or blade, cap iron or chip breaker, makes no difference. Language changes over time. We don’t speak old english anymore.

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controlfreak

960 posts in 410 days


#5 posted 07-07-2020 01:43 PM


We don’t speak old english anymore.

- OSU55


That would be the King’s english I believe ;-)

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Sylvain

1053 posts in 3308 days


#6 posted 07-07-2020 03:29 PM

As said above,
the frog hold the iron at a bed angle;
the frog can be moved forward and backward, although most people will never change this setting;
the frog holds the means (yoke, depth adjuster) to advance and retract the iron to adjust the shavings thickness;
the frog holds the lateral lever to bring the cutting edge of the iron parallel to the sole;
the frog has a screw to hold the lever-cap and adjust its pressure on the cutting-iron/cap-iron assembly.

https://paulsellers.com/2015/07/understanding-the-frog-in-your-throat/
https://paulsellers.com/2015/07/understanding-the-frog-in-your-throat-part-ii/

For an easy adjustment, the iron/cap-iron assembly must be able to slip between the lever-cap and the frog. Keep everything smooth and oiled. Adjust lever-cap pressure as needed.

-- Sylvain, Brussels, Belgium, Europe - The more I learn, the more there is to learn

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