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Tool Vevor Drill Bit Sharpener Improved

Tool
TorontoBuilder said:
To grind milling cutters the tool seat is moved 90 degree to present the end mill to the face of the wheel at a 2 degree offset IIRC. The tool setter is different too.

Then the points are ground using a split point gauge that is angled to the top of the wheel. Only old style vevors had the ability to change the insert in the spilt point gauge.

Below is a dedicated end mill sharpener based on the same design. You can see blocks for what appears to be flute grinding and I believe relief grinding as well. Can easily make a stamped metal guard to cover the end but you could 3d print one. Interesting mods to be made to this machine...

Correction: The two gauges on the left hand side of the machine are the secondary relief angle cuts. The gauge closest to the body cuts secondary relief of 3/4 flute end mills, the one furthest away cuts secondary relief on 2 flute end mills. Flutes are cut using other side of the machine with different wheel and R8 collets to hold end mill.
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Where did you find all this info! Ya, sounds super exciting!!! Would love to see what people can up with!
 
Canadium said:
Where did you find all this info! Ya, sounds super exciting!!! Would love to see what people can up with!
Click to expand...

I searched for end mill and drill grinders and then culled thru the results to find all those that used the same form factor and collet holders.

Then when I'd find a vendor I'd look through every product they had and find various similar grinders. This is a very common form factor.

I'm now looking to see what parts can be found in addition to the two different sized collets and the grinding seat.
 
My wife's rock and gem club are buying their lapidary diamond wheels from Baltic Abrasives . When you get the deluxe they are equal to NA, and cheaper as well as being better than the Chinese. They also sell regular grinding wheels like CBN.
 
Can someone with a model 13A please take and post a photo like the one below.

You're phone needs to be level and coplanar with the top of the machine. the grinding wheel should be exposed and the shaft as visible as possible

20241230_174334.jpg
 
I have a question for one of you gents that has one of these machines. When you place the collet assembly. in the first hole to sharpen the drill, is the motion of the drill bit concentic or eccentric to the hole that the collet goes into? (rotates around the center or offset from center)
 
Perry said:
I have a question for one of you gents that has one of these machines. When you place the collet assembly. in the first hole to sharpen the drill, is the motion of the drill bit concentic or eccentric to the hole that the collet goes into? (rotates around the center or offset from center)
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I dont think so. I'll confirm tomorrow
 
Making it a duo.

Replace main upright with newly milled block, or mill existing upright flat on top. Mill split point tool block mount, mill web thinning tool block pivot mount, mill both tool blocks. Assemble.

duo.PNG



duo 2.PNG



duo 3.PNG



The rear of the we thinning tool block is relieved to allow depression from 90 degrees. The spring sits in a pocket on the main upright.
The hole in the tool block for the height adjuster is a slot.


duo 4.PNG


I intend to 3D print parts for a prototype to test the positions of the tool block, then make actual parts after testing.

Edit: I haven't yet drawn in the collet chuck locator pin locations and pins.
 
Perry said:
I have a question for one of you gents that has one of these machines. When you place the collet assembly. in the first hole to sharpen the drill, is the motion of the drill bit concentic or eccentric to the hole that the collet goes into? (rotates around the center or offset from center)
Click to expand...

I don't think it's possible to be other than concentric. ER Collets are concentric by definition.

If you mean the collet holder instead of the drill bit, all bets are off. Mine is ordered but has not arrived yet.

But looking at the holder in the various videos and photos, as well as the holder receptacle, it appears to be concentric too. The camming action appears to result in an axial motion. This is different from the drill doctor which cams both axially and eccentrically.

I hesitated to respond to your question because I really won't know till mine arrives. But after thinking about it a bit, I decided it was better to get all of us thinking about all the many possibilities.
 
I have two of the drill doctors, 1 is a 500 I think, the other not sure. Both old, maybe not all there, plastic, setting collet seems a bit goofy. They seen to work a bit, though I am not impressed. Seem to be ment for “a light touch up”, any serious amount of metal removal takes a long time, and is perhaps better, faster by hand, followed by a tune up, finish on a drill doctors. The ones I have came inherited, could be worn out stones?
The Vever units look interesting and the possibility of end mill sharpening would make them even more so.
 
Susquatch said:
I don't think it's possible to be other than concentric. ER Collets are concentric by definition.

If you mean the collet holder instead of the drill bit, all bets are off. Mine is ordered but has not arrived yet.

But looking at the holder in the various videos and photos, as well as the holder receptacle, it appears to be concentric too. The camming action appears to result in an axial motion. This is different from the drill doctor which cams both axially and eccentrically.

I hesitated to respond to your question because I really won't know till mine arrives. But after thinking about it a bit, I decided it was better to get all of us thinking about all the many possibilities.
Click to expand...

The collet chucks are concentric.

The grinding seat that the collet chuck sits in is canted at about a 5 degree angle from the vertical plane the seat sits, so in action I do believe that the drill bits do take an eccentric path as the bit is rotated.

1735660613036.png
 
So @Susquatch it seems none of those cliquey 13A boys want to help us out with an accurate photo so I can check the dimensions to assure the proper alignment of the tool blocks.

I think they're pretty good right now, but I want to be more certain before I crank up the 3D printer.

1735665620876.png
 
TorontoBuilder said:
The collet chucks are concentric.

The grinding seat that the collet chuck sits in is canted at about a 5 degree angle from the vertical plane the seat sits, so in action I do believe that the drill bits do take an eccentric path as the bit is rotated.

View attachment 56952
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In addition to the grinding seat fixture being canted about 5 degrees off of vertical, I've found that the rotation is also offset and as you can see from the screen cap the bore is eccentric to the bearing in which the ER collet chuck rotates as well.

1735673639860.png
 
Perry said:
I have a question for one of you gents that has one of these machines. When you place the collet assembly. in the first hole to sharpen the drill, is the motion of the drill bit concentic or eccentric to the hole that the collet goes into? (rotates around the center or offset from center)
Click to expand...

Susquatch said:
I don't think it's possible to be other than concentric. ER Collets are concentric by definition.

If you mean the collet holder instead of the drill bit, all bets are off. Mine is ordered but has not arrived yet.

But looking at the holder in the various videos and photos, as well as the holder receptacle, it appears to be concentric too. The camming action appears to result in an axial motion. This is different from the drill doctor which cams both axially and eccentrically.

I hesitated to respond to your question because I really won't know till mine arrives. But after thinking about it a bit, I decided it was better to get all of us thinking about all the many possibilities.
Click to expand...

Mine has arrived. As indicated earlier, the collet and collet holder is axial and because the collet holder rotates in a fixed housing, the rotation of the drill bit in the top receptacle is also axial.

However as @TorontoBuilder says, the collet holder in the bottom housing has a fixed location for the collet holder where the collet holder does not rotate but the housing does. This results in an eccentric rotation of the drill in that location.
 
I gotta say that I am totally shocked by this Vevor product. It has a solid feeling of quality and a look and function that I would NEVER have anticipated.

My 3 ton Vevor press works, but it is total junk by comparison to this beauty.

I AM VERY IMPRESSED!

BTW, the collet holder is very atypical. It does not require any dexterity to insert the collet at all. The retainer lip is much smaller and works just fine without any manual pressure at all. The collet literally slips right in. I suppose that might come at a price when it comes to removing a very tight collet. But even if so, it would still be easy to knock the collet out with a punch or drift. This design might become yet another project on my list. (which reminds me I need to update with our 13AB Drill Sharpener! LOL!
 
Susquatch said:
I gotta say that I am totally shocked by this Vevor product. It has a solid feeling of quality and a look and function that I would NEVER have anticipated.

My 3 ton Vevor press works, but it is total junk by comparison to this beauty.

I AM VERY IMPRESSED!

BTW, the collet holder is very atypical. It does not require any dexterity to insert the collet at all. The retainer lip is much smaller and works just fine without any manual pressure at all. The collet literally slips right in. I suppose that might come at a price when it comes to removing a very tight collet. But even if so, it would still be easy to knock the collet out with a punch or drift. This design might become yet another project on my list. (which reminds me I need to update with our 13AB Drill Sharpener! LOL!
Click to expand...
I'm impressed too, especially with the collet chucks. They're well machined and the threads feel really smooth.
 
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