Sure, I'd like to see them.
-
Scam Alert. Members are reminded to NOT send money to buy anything. Don't buy things remote and have it shipped - go get it yourself, pay in person, and take your equipment with you. Scammers have burned people on this forum. Urgency, secrecy, excuses, selling for friend, newish members, FUD, are RED FLAGS. A video conference call is not adequate assurance. Face to face interactions are required. Please report suspicions to the forum admins. Stay Safe - anyone can get scammed.
Tool Vevor Drill Bit Sharpener
- Thread starter canuck750
- Start date
Tool
Sure, I'd like to see them.
TorontoBuilder
Sapientia et Doctrina Stabilitas
Different vendor from yours, and @Susquatch these are only 3 bucks shipping each, so you must have been referring to the vendor of the ER25 chuck.
The other vendor also different from yours doesnt have pics of the 1 and 2mm collets, but their shipping is free right now with purchase over 10 bucks
@Susquatch @TorontoBuilder ....show me the money!! Please sharpen a drill bit and let me see what it looks like, before any mods to the machines.
TorontoBuilder
Sapientia et Doctrina Stabilitas
I'm a scientist. I live for data. I also do not rush when designing analytical methodologies.
Firstly, I'll buy 3 cheap princess auto drill bit sets typically found in a home shop. Ya'll know you got em.
One set will be kept aside to serve as the control sample with standard factory finish.
One set will provide the sample grinds for the unmodified 13B machine, as per the manufacturer's recommended settings.
One set will provide the sample grinds for the modified 13B to 13D conversion machine. This set will be ground to an optimized grind for each size of bit because there will not be a manufacturer's recommended setting.
The grinding sample sets will be in the following sizes; 2mm, 4mm, 6mm, 8mm and 10mm because 10mm is the largest bit in the set. This sample will require the use of the non-standard 2mm collet from outside vendor.
The modified 13D machine will use all newly machined custom parts so I haven't forever altered the original 13B grinder.
Close up photos of each sample set will be taken under the same work-holding and lighting set-ups for visual comparisons. The physical testing of the grinds will be conducted.
I'll rig a test wheel and weight to my standing drill press and compare the drill times to penetrate steel plates using the 3 different bit sample sets.
The drilled holes where large enough to visually inspect the hole will also be photo documented for comparison.
I'll solicit group feedback on a weighting matrix for evaluating each grinding set, but I'm sure it will be heavily weighted towards fastest drilling times.
Edit. I'll likely even conduct the 13D tests using wimpy less rigid 3D printed parts for chits and giggles. Then repeat when I have the metal parts all made
Last edited:
sentence-1: Then you will also appreciate the notion of garbage in = garbage out LOL.
sentence-2: That's exactly the route I went down thinking I cannot mess up bad drills anymore than they are. Well yes & no. It took me some futzing about to familiarize myself to my TCG setup & that's another story. But it only took a couple mm of grinding dust to get up to speed.
My 5C collet block fixture is pretty simple but dimensionally reliable. It holds a drill concentrically & terminates grinding DOC to a locked foot stop. Flip the block 180-deg & repeat. So why do some of these sh*tty Princess Tire drills have blatant unequal re-grinds on the primary facet? Some answers: banana axis vs straight. Elliptical cross section vs circular. Unequal flute relief profile so cutting edge is displaced. Not all, or to the same degree but enough that I'm just wasting my time. I put in a dull HSS Sears drill from the 70's & the point is damn near perfect first try. Its the proverbial sows ear. Sadly I can't even think of something to do with the crappy offshore drills to harvest the material. Having said that, I gambled on an inexpensive 2-10mm metric set of AliExpress drills for the house chores toolbox & turns out they are awesome. So they earned a spot on the drill press podium. The issue is you just can't tell by the picture or even so called feedback like "Look good, well packaged, came quick, will try them soon"
Attachments
TorontoBuilder
Sapientia et Doctrina Stabilitas
grinding crappy drills is really a test of the grinder's ability to deal with poorly manufactured bits.
I'm happy to test aliexpress cheapies if you have links to better bits that wont break the bank
I really don't think you need to grind more than a few to see what happens. The results should be obvious.
Unless you want to do it just to try and make them into decent drills.
We did that over in the other thread. (maybe we shouldn't have separated them.....)
Here is a photo of a dull 1/4 drill
Sharpened by drill doctor 250
Sharpened by Drill Doctor 750
Sharpened by Vevor 13B
With back relief by Vevor 13B
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...
Sharpened by drill doctor 250
Sharpened by Drill Doctor 750
Sharpened by Vevor 13B
With back relief by Vevor 13B
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...
And here is another photo of the final results taken from a different angle:
This last grind could be improved with a scooch of additional depth on the web thinning.
But I think the litmus test was drilling a few holes. They were amazing. No wander and beautiful cutting.
Last edited:
TorontoBuilder
Sapientia et Doctrina Stabilitas
damn I missed the 17mm collet in my order. I thought I'd added it but it is missing from my orders...
I could get an extra for you if you can wait for it a bit.....
TorontoBuilder
Sapientia et Doctrina Stabilitas
nah I'll just order it separately... they have no minimum order and low shipping cost
Ok. Thank you. I didn't see it on the other thread.We did that over in the other thread. (maybe we shouldn't have separated them.....)
Here is a photo of a dull 1/4 drill
Sharpened by drill doctor 250
Sharpened by Drill Doctor 750
Sharpened by Vevor 13B
With back relief by Vevor 13B
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...
And here is another photo of the final results taken from a different angle:
View attachment 57097
This last grind could be improved with a scooch of additional depth on the web thinning.
But I think the litmus test was drilling a few holes. They were amazing. No wander and beautiful cutting.
Looks good. I'll likely get one soon.
Ironman
Ultra Member
Will you be posting dimensions so we can build as well?
Aarknoid
Well-Known Member
Attachments
I think your photos are just fine. Now I know how they managed to do 20mm in an ER25. I just couldn't see it before.
Lots of new or copied ideas in that device. Some things are still a mystery to me, and many ah-so moments.
Canadium
Ian
In my 13 A kit from Vevor only 3 of the smallest collets are this weird configuration. The rest are just regular ER 20 collets. Is this the same as what you guys got in yours???