Harold Hall Mill Bit Sharpener

[YotaBota]

It Works!!!!.
Here is a link to the instructions and prints, http://homews.co.uk/page121.html
It worked out pretty well, I changed the measurements to imperial (ish) and used what material I had on hand. The M4 and M5 were changed to 10-32 and I used 5/16 NC bolts instead of the M6 stated. Where it called for a 1/4 -40 thread I just used a 1/4 -28 since I don't have a 40 thread tap. The body was drilled using 1/4, 11/32 and 1/2 inch and then the stop was machined to fit the body. For the PIN, I didn't like the idea of riveting so I used a shouldered 4-40 screw, threaded the stop to match, cut the shoulder about a 1/2 inch long then used LockTite to hold the pin in the body. Now there is no chance of the "rivet" coming loose and it still lined up well with the body.
A word of caution - when you touch the mill bit to the wheel it only takes a half a second for the end of the bit to turn blue, you need to use short touches and low pressure against the wheel.
I'm going to call this one done, now onto the carriage stop.

 

[YYCHM]

NICE!!!! You going to offering a sharpening service now? I have a dozen or so EMs that need some TLC.

Craig

 

[YotaBota]

I think I'll pass on the sharpening service, I have enough of my own bits to sharpen. Your wobbler turned out well, this should be a breeze for you to put together.

 

[YYCHM]

Ya, I've been eye balling that very same jig you built for quite some time now. Time to get her done I think.

 

[YYCHM]

Well..... you inspired me to get her started.



Made the 1/2" tool holder today. Tomorrow I'll tackle the body and stop.

Cheers,

Craig

 

[Tom Kitta]

Yeah I should start thinking of making some endmills sharper I own a TC&G and I have one of these air bearing gizmos - should at least get it all working. For sharpening the front only I also have a little fixture that takes 5C collets so I can do bigger stuff (air bearing maxes at 5/8).

 

[YotaBota]

You did the easy part first. Amazon delivered me a new set of 3/8 bits so I need to make a holder for them, sounds like today's project.

 

[Brian H]

It Works!!!!.
Here is a link to the instructions and prints, http://homews.co.uk/page121.html
It worked out pretty well, I changed the measurements to imperial (ish) and used what material I had on hand. The M4 and M5 were changed to 10-32 and I used 5/16 NC bolts instead of the M6 stated. Where it called for a 1/4 -40 thread I just used a 1/4 -28 since I don't have a 40 thread tap. The body was drilled using 1/4, 11/32 and 1/2 inch and then the stop was machined to fit the body. For the PIN, I didn't like the idea of riveting so I used a shouldered 4-40 screw, threaded the stop to match, cut the shoulder about a 1/2 inch long then used LockTite to hold the pin in the body. Now there is no chance of the "rivet" coming loose and it still lined up well with the body.
A word of caution - when you touch the mill bit to the wheel it only takes a half a second for the end of the bit to turn blue, you need to use short touches and low pressure against the wheel.
I'm going to call this one done, now onto the carriage stop.

That is an awesome little project. Nice Job!
Now I have another tool to make...and I thought I was getting caught up with my "things to do" list...LOL

 

[Brian H]

Well..... you inspired me to get her started.

View attachment 8372

Made the 1/2" tool holder today. Tomorrow I'll tackle the body and stop.

Cheers,

Craig

Nice!
Hey, did you make the vise on your mill? I like it! I have been looking at some "compact" 3-4" vises, but, they don't fit in my budget. It's tough to get good tooling for the small mills

 

[Crosche]

Nicely done!

 

[YYCHM]

Nice!
Hey, did you make the vise on your mill? I like it! I have been looking at some "compact" 3-4" vises, but, they don't fit in my budget. It's tough to get good tooling for the small mills

Didn't make it, it came from BB. It's ok, but very limited as to what it can hold.

https://www.busybeetools.com/products/milling-vise-low-profile-1-7-8in.html

What are you using now?

 

[Brian H]

Didn't make it, it came from BB. It's ok, but very limited as to what it can hold.

https://www.busybeetools.com/products/milling-vise-low-profile-1-7-8in.html

What are you using now?

I got this one on Amazon for $120. Its really sturdy and accurate, but a bit awkward due to its size.

 

[YYCHM]

I got this one on Amazon for $120. Its really sturdy and accurate, but a bit awkward due to its size.

YIKES And I thought my 4" soba overwhelmed my mill, that's crazy.

 

[YYCHM]

Well..... Busy Bee in Calgary is closed until further notice. Now I'm really motivated to get this jig up and running.

I've discovered a SNAFU with the design. It doesn't accommodate ends mills 1" and larger

 

[Tom Kitta]

I had same vise on my mini mill like 4 years ago or 5. It was a bit ... big. I used it later on as a drill press vise - not very precise - got it from KMS & sold it few months ago.

 

[YYCHM]

Progress. Tool holder, body, stop and feed screw (1/4 X 20)

I hate metric plans, they just send me into a dither on how to sub metric to imperial.

This post is actually 3 days older than time tagged. Guess I never saved?

 

[YYCHM]

First brain fart of the project.....



That pin was supposed to follow the stop!!! Couldn't figure out why the plans called for riveting the pin????? Rivet it to what? Now I get it LOL. Oh well, will be making another stop when my 1/4X40 tap arrives.



Can't proceed with the table until I figure out how it's going to mount on my bench grinder. That factory table bracket is a problem, it's riveted on!!

 

[Brian H]

First brain fart of the project.....

View attachment 8451

That pin was supposed to follow the stop!!! Couldn't figure out why the plans called for riveting the pin????? Rivet it to what? Now I get it LOL. Oh well, will be making another stop when my 1/4X40 tap arrives.

View attachment 8452

Can't proceed with the table until I figure out how it's going to mount on my bench grinder. That factory table bracket is a problem, it's riveted on!!

That looks pretty nice.
(It would appear we shop at the same store...PA blue...LOL)
I have seen a couple youtubers that have made full width tables for their bench grinders would that be an advantage here? Do you have to adjust the height for each diam. of cutter? I read through the webpage and I was confused about a couple parts.

 

[YotaBota]

In theory I don't think it should matter if the pin is attached to the stop or the body, as long as the stop slides freely.
For the mounting bracket if you drill out the rivets, is there room between the guard and the wheel to allow bolting the bracket back on? If that works then drill the new support bracket to match the holes in the guard and carry on.
So far so good.

 

[YYCHM]

That looks pretty nice.
(It would appear we shop at the same store...PA blue...LOL)
I have seen a couple youtubers that have made full width tables for their bench grinders would that be an advantage here? Do you have to adjust the height for each diam. of cutter? I read through the webpage and I was confused about a couple parts.

No height adjustments required once it's set up. Which parts are you finding confusing?

Craig