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Tool Vevor Drill Bit Sharpener Improved

Tool
Susquatch said:
The rest of us are counting on you Ian! And the whole world is watching too!
Click to expand...
with the whole world watching maybe @Canadium will want to just disassemble the end of his unit and place each of the two plates circled in the image below on a photocopier and scan them along with a ruler.

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watch this to see how easy it is to disassemble the unit.

 
Ok, I do not believe the Vevor sharpens a drill with a true 4 facet grind. I am most likely wrong. If the drill is turned in a eccentric path around the stone you are preforming a conical sharpening of the drill bit. The bit is then given a relief angle. (on the 13A.) This is not 4 facet sharpening.

Conical sharpening will produce a center chisel that is flatter then a true 4 facet grind.
 
Perry said:
Ok, I do not believe the Vevor sharpens a drill with a true 4 facet grind. I am most likely wrong. If the drill is turned in a eccentric path around the stone you are preforming a conical sharpening of the drill bit. The bit is then given a relief angle. (on the 13A.) This is not 4 facet sharpening.

Conical sharpening will produce a center chisel that is flatter then a true 4 facet grind.
Click to expand...

I'm not sure I understand your comment. The Vevor has two sharpening fixtures for the collet. One has an elliptical motion and the other is axial.

The difference between the A and B model is in the kind of axial motion. I'm going to take some photos of the grind later today.
 
On both the Vevor models, the first step of sharpening the drill is a conical sharpening of the drill. It is not facet sharpening. You can not produce a 4 facet drill with a conical sharpening.

I believe most 4 facet grinding is done by moving the drill facet in a linear motion across the grinding wheel. Conical sharpening is done with a twisting motion of the drill onto the grinding wheel.

Let me see if I can find some valid references.
 
Perry said:
On both the Vevor models, the first step of sharpening the drill is a conical sharpening of the drill. It is not facet sharpening. You can not produce a 4 facet drill with a conical sharpening.
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I don't agree @Perry. That is not how this device is used.

The first step is an orbital movement (not a conical grind) to grind the two primary cutting faces. This is the same as a regular drill and the same as the drill doctor does. This photo shows the cam that produces the elliptical cut. The collet holder is fixed in the cam. As the cam rotates the collet moves in the required eliptical path.

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The second step grinds the split point on model A or 4 different conical relief angles on the B model. A true four face grind.

What we want to do is add the split point feature to the B model or the Relief cut for the A.

drill-bits-sharpener-a100-2.2-m.jpg

I'll take some point photos later today.
 
I have noted the recent change in their products. Maybe all the shit I raised with them helped, and I filled out many customer feedback questionnaires. When I ordered the Mag drill from them, I expected more chinese junk, and I am totally stunned at the quality of this tool. I plan to get a 13B once I sell My DD750X, which I located today. Pretty well new in case, even has the manual and spare grinding wheel.
 
skippyelwell said:
John, do you think that modifying the Vevor 13b to sharpen end mills is doable?
I think most of us would be in the market to either buy one or try to make one ourselves if there were plans.
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Can you sharpen carbide mills with diamond wheels? I think that does not work, but HS cutters would.
 
Ironman said:
When I ordered the Mag drill from them, I expected more chinese junk, and I am totally stunned at the quality of this tool.
Click to expand...

I keep looking at mag drills for farm machinery repair. This one would be a writeoff for me. Which one did you get?
 
Ironman said:
Can you sharpen carbide mills with diamond wheels? I think that does not work, but HS cutters would.
Click to expand...

Yes, No, No. See my post#19

P

Tool Post in thread 'Vevor Drill Bit Sharpener Improved'

Just be aware, I've been going through this on replacement wheels for my TCG. On AliExpress they tend to use the words CBN (Cubic Born Nitride) & Diamond rather fast & loose - interchangeably and often incorrectly. When you see a specific form factor wheel for say a knife sharpener or possibly machine like this, you might stand half a chance CBN really means CBN.

The difference is not about hardness, diamond is actually a bit harder. The issue is diamond does not play nice with HSS, specifically carbon of which its comprised of. Now I've heard different stories like only an issue at...
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Here is a photo of a dull 1/4 drill

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Sharpened by drill doctor 250

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Sharpened by Drill Doctor 750

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Sharpened by Vevor 13B

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With back relief by Vevor 13B

20250101_115330.jpg

I suppose with some adjustment, the back relief could be improved.

Comments:

Setting the drill bit properly in the collet is not a straightforward process. With time, I think we could collectively develop a better procedure than Vevor did.

The back relief could probably use a scooch more depth. As it is, I set the depth by eye. I am sure it can be improved, but I think some team discussion is required. In any event, you can see the beginnings of a nice split point.

How do they drill? As you might expect, each level up was a fair bit better than the step behind! I only tried plain old cold rolled steel.

Is it worth the money? DAMN RIGHT IT IS!
 
This is how they go together. What we would call a collet nut is on the right.

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Here is a close up of the nut. Note the very small retainer lip. It works great!

20250101_122213.jpg

Here is the assembly semi-assembled:

20250101_122316.jpg
 
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So please confirm what we are looking at here. To my eye:
1 = primary relief & its curved or helical, either by cam action or swing action? (as opposed to a facet by definition flat planar surface)
2 = secondary relief. Is this surface also a helical grind, just at a slightly higher relief angle? Or is this kind of combo web thin because it seems to extend up into the center core forming +/- something like a split point. Or maybe there is a step 3 web thinning near the center web after 1 & 2?

here is typical 4 facet grind for visual reference
1735754438617.png
 

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skippyelwell said:
John, do you think that modifying the Vevor 13b to sharpen end mills is doable?
I think most of us would be in the market to either buy one or try to make one ourselves if there were plans.
Click to expand...
I sat with my brother and discussed these machines at length while looking at marketing videos of all the products.

Many of them are all based on the same chassis. And yes they can be modded. I plan to work out the drill grinder mod first, and then the end mill mod. It is simple enough, but it would require a cheap 13A base or a change over of the end fixtures and separate tool setter.
 
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