Hollow grinding

N

Natlek

Joined
Jun 9, 2015
Messages
6,182
Perhaps the easiest to grind free hand but still need some experience . I can grind free hand but not as fast as i like .Fast moving belt and high pressure make it little tricky for me to hold steel steady and comfortable . . .I make one jig but it is very limited what can be grind with that .Then I watch this Japanese master .......... :) I never seen someone to grind hollow like that ?? Never ! If you don't like to watch the whole clip start at 16 min. Ingenious ! And it can t be faster then that ................. no way !! 24 sec. for one side :D
So I make some small rest plate for my new grinder........I will finish tomorrow one smaller from steel , I need only to taper that hole . I didn't want to ruin this HT-ed 5160 blank so I used guide for grinding in it .I grind normal way ...from plunge to tip and it works .I will make some adjustable guide for that rest plate tomorrow to get rid of that clamp and i will cut other blank , HT it and i will try the Japanese way :D
Thanks Hiroshi Suzuki :thumbsup:
Just watch what is fast grinding ....first tip , then little more and more and finished :D

26FQpOT.jpg

Fuuejst.jpg

Bx45V1F.jpg

GeOBqXV.jpg

zqFSBbC.jpg

F5Kn152.jpg

UgsX1gq.jpg
 
Last edited:
Wow, you put that together QUICK! I'd love a little 2" work rest, need to become self sufficient like you and just make my tools LOL.
 
Very nice, Natlek. I don't know if that is necessarily the Japanese way, though. There are a few threads here with similar tool rests and I've seen a few youtube videos where people use narrow rests with a push stick. In this thread, @NC Biker takes the concept even further with a truly minimal tool rest. see his video below. I am getting tired of grinding off my fingernails and am tempted to try something like that.
 
Hubert S. said:
Very nice, Natlek. I don't know if that is necessarily the Japanese way, though. There are a few threads here with similar tool rests and I've seen a few youtube videos where people use narrow rests with a push stick. In this thread, @NC Biker takes the concept even further with a truly minimal tool rest. see his video below. I am getting tired of grinding off my fingernails and am tempted to try something like that.
Click to expand...
Hubert it is not about small tool rest it is about HOW he grind bevels..........Start grinding from tip have HUGE advantage on already hardened steel ,chance to overheat tip are almost zero . Watch carefully how he grind.....first tip almost to center line , than part by part towards plunge .THAT way he grind small amount of steel and that s why it is going fast !
He grind something like in this picture...numbers are step .....in first step he grind 1 then 2 .....etc
I never seen someone else to grind like that .
ZtDpplc.png
 
Last edited:
Natlek said:
Hubert it is not about small tool rest it is about HOW he grind bevels..........Start grinding from tip have HUGE advantage on already hardened steel ,chance to overheat tip are almost zero . Watch carefully how he grind.....first tip almost to center line , than part by part towards plunge .THAT way he grind small amount of steel and that s why it is going fast !
He grind something like in this picture...numbers are step .....in first step he grind 1 then 2 .....etc
I never seen someone else to grind like that .
ZtDpplc.png
Click to expand...
I see now. Sorry, I thought it was all about the narrow tool rest and the push stick, I did not pay much attention to the video. So, is the piece you have clamped to the tool rest a back stop for the spine to give you a consistent angle? I did not see that part in the video, seems to just be a flat narrow rest.
 
Hubert S. said:
I see now. Sorry, I thought it was all about the narrow tool rest and the push stick, I did not pay much attention to the video. So, is the piece you have clamped to the tool rest a back stop for the spine to give you a consistent angle? I did not see that part in the video, seems to just be a flat narrow rest.
Click to expand...
Yes , I used/added that to have consistent angle and i like it so i will make adjustable one . Japanese also use two tool rest , one /simple tube on bearing/ for each side of grinding wheels .....on bearing :)
Something like this , i will try to find that video....I like that to :thumbsup:
rjGvgVk.png
 
Come to think of it I believe I’ve seen Japanese smiths grind kitchen knives from tip to heel on a wooden board using large water stones, also I’d think working that way would make putting your plunges in easier since your only removing a small amount then blending versus starting at the plunge with all that material in the way. Thank you for sharing that video, I’ve got some grinds to so in the morning and may give that a try. I’ve done some push stick grinding before using the narrow rest on the shopfox/grizzly grinder and the contact wheel and it did work nicely but I need to give it some more time to get comfortable instead of just freehand grinding.
 
Would this method be as effective with a platen flat grinding vs the hollow grind shown (seems like it should?)?
 
Hubert S. said:
I see now. Sorry, I thought it was all about the narrow tool rest and the push stick, I did not pay much attention to the video. So, is the piece you have clamped to the tool rest a back stop for the spine to give you a consistent angle? I did not see that part in the video, seems to just be a flat narrow rest.
Click to expand...
Watch this .....from 9 min. :thumbsup:
 
You must log in or register to reply here.
Back
Top