Not my invention, but it works well on 2 flt and 4 flt end mills 1/4" and larger and is a pretty easy project to build.
http://homews.co.uk/page121.html
http://homews.co.uk/page121.html
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Easy End Mill Sharpening Jig Project
- Thread starter YYCHM
- Start date
Does it do a near factory job ? Looks good
Not even close. It only sharpens the primary/secondary angled portions of the end face, does nothing to the flutes. But I will say having it quadrupled the life I get out of my end mills. It will handle 1/4"-1" endmills and two flute are the easiest to sharpen. Four flute are a little picky to do.
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Former Member
Guest
You can also use your mill to sharpen them, with better results as it is more controllable, using similar fixtures. Basically you are converting you mill into a precision grinder. No I have not personally tried it.
Fixtures for surface grinders (if you gave the grinder)
Denkle Clone (I have a Shars one as it uses 5c collets), still learning. Does Flutes and leading edge, center cut, can but still figuring that out.
True purpose built grinders.
Journeyman Grinder.
Final true dedicated CNC grinder regrinders if you have the budget (ie win the lotto).
Important thing to remember HSS regular grinding wheels, Carbide, diamond wheels a must.
Fixtures for surface grinders (if you gave the grinder)
Denkle Clone (I have a Shars one as it uses 5c collets), still learning. Does Flutes and leading edge, center cut, can but still figuring that out.
True purpose built grinders.
Journeyman Grinder.
Final true dedicated CNC grinder regrinders if you have the budget (ie win the lotto).
Important thing to remember HSS regular grinding wheels, Carbide, diamond wheels a must.
Former Member
Guest
Denkle Clone or Journeyman likely the best.
Hey Craig are you still using the sharpening jig? How has it worked for you? This is a project I might bump up on my list, as I am moving I'm finding more of my squirreled away end mills and drill bits that need sharpening.
I think it's worth building. I have quite a few endmills I use that are on their 3rd or 4th re-sharpening.
Harold Hall Mill Bit Sharpener
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...
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Weldon makes a endmill sharping fixture for surface grinder but probly could be set up for use with dremel or bench grinder. There not overly expensive I bought one bit ago but haven't used it yet.
Weldon Tool Sharpening Fixture End Mill Grinding w/ Tilting Table Sub Base | eBay
Find many great new & used options and get the best deals for Weldon Tool Sharpening Fixture End Mill Grinding w/ Tilting Table Sub Base at the best online prices at eBay! Free shipping for many products!
www.ebay.com
Attachments
Looks very interesting. The real deals are too much money for how often I'd use it. This one is still way too much coin. But at least I can see the makings of a home made unit that could do the basics.
But first I have to learn to sharpen drill bits......
Well guess what I found
Yep it’s the base for it Looks like a basic Sine Plate nothing special or hard to make.
( They even give you the measuring units. )
Weldon End Mill Grinding & Sharpening Fixture Tilting Sub-Base | eBay
As shown, in good, sound condition with scattered cosmetic wear.
www.ebay.com
( They even give you the measuring units. )
Blondihacks recently finished machining & assembly of a tool sharpener kit from Eccentric Engineering down under. I was interested in the possibility, but at $280+ (depending on the collets one purchases) not including shipping, I'm questioning the value.
For that matter, I'm beginning to question the value of a lot of these kits. A few bucks in raw materials, laser cut a handful of pieces, include a print of machining instructions (or not!), et voila! A license to print money.
For that matter, I'm beginning to question the value of a lot of these kits. A few bucks in raw materials, laser cut a handful of pieces, include a print of machining instructions (or not!), et voila! A license to print money.
Proxule
Ultra Member
Ding ding ding !
I was disappointed in her video. It smells of someone who was gifted a tool in return for internet exposure. That's perfectly fine in my books, but she all but admitted the endmill grind was not correct. The primary/secondary certainly did not look right to the naked eye. But she promptly stuck in the mill anyways, plowed through some brass with a finish that had obvious defects. What did that prove? If the instructions or her interpretation or design were incorrect, how about hold off & get it resolved beforehand instead of wasting everyone's time?
The jig itself looks like there was a lot of thought put into it, but I dunno, looks pretty fiddly. Not being negative because most tool cutter geometry is not exactly trivial & the whole setup assembly has to kind of work backwards starting from whatever wheel/grinder is selected. I actually think he could have eliminated a lot of the custom holders & angle setters with cheapo offshore 5C collet block which already has 4 or 6 accurate reference planes to flip while still holding the cutter. Then you could grip any size of round (or square for that matter) tool shank using off the shelf collets. I'm certainly no expert. I continue to screw around with an offshore TCG (D-bit grinder) that does some things OK & other things somewhat crappy. I don't think there is a perfect grinding machine that doesn't cost as much as a lathe, so you have to kind of pick your battles of what you want to sharpen or re-dress.
The jig itself looks like there was a lot of thought put into it, but I dunno, looks pretty fiddly. Not being negative because most tool cutter geometry is not exactly trivial & the whole setup assembly has to kind of work backwards starting from whatever wheel/grinder is selected. I actually think he could have eliminated a lot of the custom holders & angle setters with cheapo offshore 5C collet block which already has 4 or 6 accurate reference planes to flip while still holding the cutter. Then you could grip any size of round (or square for that matter) tool shank using off the shelf collets. I'm certainly no expert. I continue to screw around with an offshore TCG (D-bit grinder) that does some things OK & other things somewhat crappy. I don't think there is a perfect grinding machine that doesn't cost as much as a lathe, so you have to kind of pick your battles of what you want to sharpen or re-dress.