Putting a four facet grind on drill bits for

I build a D-bit grinder from scratch for #roughcut2022 to regrind my collection of worn and broken drill bits with a four facet grind.
Links:
Emma: / emmaritson
Stefan Gotteswinters video on the four facet grind: • Toolgrinding: Four fac...

[@HM-Projects]

Nice D-bit grinder setup.

[@gaulix69]

you have a angles issues. you said you set the griinder for a 118° but by eye I can say your tip angle after sharpening look like 135°. second problemn the cutting edge isn"t parallele to the secondary facet edge. this such drill bit for stainless style have a thick web and need pliting point for thining the web.

[@rok1475]

It looks like the index changes when you switch from grinding primary to secondary relief. This is the reason for the secondary relief facets to look like triangles rather than rectangles they should be. You may need to have additional stop to adjust the index for the secondary relief grid.

[@ramonching7772]

I am curious. #1 is the hole clean? #2 if clean, I wonder if you can indicate the hole wall to see if it is such a grind can improve hole size accuracy and position.

[@derekturner3272]

Where did you find the 5C collet attachment? I want to get one for my grinder than uses long skinny who knows collets.

[@CraigsWorkshop]

Very cool Aekis. Very creative coming up with the D bit grinder design! I will be tuning in to see the in depth video about that. Cheers, Craig

[@gerritvisser]

Well done. What brand is your grinding wheel?

[@TheKnacklersWorkshop]

Hello, Good video, cool d-bit grinder... and the grinding process was nicely explained... Take care. Paul,,

[@624Dudley]

Indeed creative! I too will be tuning in for the follow-on video. 👍

[@Bojangles1987]

Optima drill grinder does this same thing supper easy

[@markrainford1219]

Yum yum, what time is supper?

[@HairyNumbNuts]

Nice home-made grinder. I like it! And I'm known as the Grumpy Old Bastard, I don't give a lot of praise.