A 4 Facet Drill Bit Grinder DIY Style Part 4
ฝัง
- เผยแพร่เมื่อ 16 มี.ค. 2023
- #shopmadetools
In this episode....
Why use a 4 facet grind on twist drills?
Trunnion plate and carriage plate uprights.
Trunnion pivot bolts.
Trunnion angle setting eccentric and sector plate.
90% completion milestone. - วิทยาศาสตร์และเทคโนโลยี
![[TH] 2024 PMWC x EWC Main Tournament Day 2 | PUBG MOBILE WORLD CUP x ESPORTS WORLD CUP](http://i.ytimg.com/vi/TgEFw285vXA/mqdefault.jpg)
Are we there yet, are we there yet ...... 🤣Ok GenZ mode off, enjoying the build and unlike some of my projects you are progressing well 👍
I know what you mean but what can I say. Lots of little parts and the builder is learning as he is going. What is that they say.... "It's the journey, not the destination!"
Regards,
Preso
Thank you for the why of it today!
Always a pleasure to watch you work.
Gotta love your background music... Always reminds me of early spring when I was growing up in Texas. The Zoo was not too far from where I lived and it sounded just like your backyard. On top of your amazing videos around this time of year, they remind me of home. ;-)
Thanks. We sometimes wish the birds were a bit more "muted" but we are lucky to have so many native species in our area.
Regards,
Mark
The birds are louder than the spindle bearings!
From my experience with the 50-60 Rainbow Lorekeets that have me as a pet, the bird noise level increases significantly when they are squabbling over the food I generously donate to them. 🦜
13:00 Sorry Mark, saw that and immediately thought whoops. Then after some thoughtful reflection I realized once again how brilliant you are for machining in a calibration slot.
John 🇨🇦
I knew it was better to come clean and own up to poor planning. There is no fooling the eagle eyed viewers!
Regards,
Mark
Great tutorial Mark 👍
Watching literally hundreds of TH-cam machining vids., those with properly ground drill bits really show.
Nothing like two ‘equal’ spirals coming off eh?
Some great ideas in this building. I love the cam and sector-arm set up.
Can’t wait for the next episode…..
Regards
Robert
PS Thanks for taking all the extra time, and all the extra work to make such a detailed video
Yes, it's always gratifying to see two nicely formed spirals being ejected from the drilled hole. Sadly, most of my drill bits are either dull or badly ground which is why I am so keen to have some sort of machine that will make regrinding easy and accurate.
Regards,
Mark
Great instrument there sir. I'm following the build with rapt attention. Thank you
Sir this is a great work, thank you for this excellent content!
Gday Preso, great job, it’s really starting to take shape now, the designer put a lot of thought into this machine, cheers
Thanks Matty. Can't wait to have some sharp drill bits for a change.
Regards,
Preso
Mark, when I made my version I made the tilting support plate wider so that the cup wheel would fit inside a larger cutout with sufficient space for the plate to move side to side. This meant that I could drill the support arms and sides at the same time didn't have the issue with angled supports and the side pieces could be drilled together to help accuracy. I also made some brass bushings to line all the holes. To help align the grinding wheel on the center line I made a rod that goes all the way through the jig that has a D profile in the middle ad the grinding wheel can be butted up against this for 'easy' alignment.
Thanks for the heads up on aligning the face of the wheel with the centre of the trunnion support. I was relying on my CAD model to help me find the position of the grinding spindle but I was then going off on a tangent and thinking about lasers etc. Your method sounds like the best solution. I am really looking forward to using it.
Regards,
Mark
Coming along brilliantly, Mark. Enjoying this series quite a lot. Thanks for sharing!
Hi Mark. Thank you for yet another interesting and informative video. Lovely machining. The fixture is coming along beautifully. Well done. 👏👏👍😀
Nice! REALLY like seeing the rear parting tool in action! Will need to add that to my "to do" list!!!
Thanks Jay. It's a game changer! Certainly lessened my anxiety about parting off.
Regards,
Mark
Keep up the amazing work
Wow, I'm finally starting to understand this project better. I've been a little confused until now. It appears it is coming together nicely. You walking through the reasoning for the 4 facet design really helped me and I can appreciate now the reasoning for it. As a beginning hobbyist into machining this is a lot of fun to see this build.
Thanks for sharing.
Diamond will work good for carbide. You may want to consider getting a CBN wheel for your steel drills. Diamond will work but CBN would be better. Also for both types of wheels a dressing stick would be good. Not for truing up the wheels but for exposing the abrasive of the wheel.
Thanks. I will be getting a CBN wheel. I am surprised that they are not as expensive as I thought they would be. I will probably have to allow for more adjustment in the positioning of the grinding spindle though. I am guessing that not all cup wheels are the same depth.
Regards,
Mark
Thanks for sharing 👍
Good job Preso. Looking forward to seeing the culmination of this project!
Almost there, Looking forward to the test run !! Super project !!
Cheers.....Dean
Thanks 👍
Regards,
Mark
12:48 apologies for that. Thanks for the great video though. I'll try and be more vigilant in future.
Beautiful work, really love the explanations, makes it easy to follow and learn.
Well done so far Mark. I loved the very cunning cam and sector arm for the primary and secondary angles! Dead clever. Thanks for your vid as well. 😊
I wish I could claim credit for coming up with the design! I must pass that credit on to John Moran though.
Regards,
Mark
Great series, Thanks a lot.
Nice work as always, nearly finished now. Side project for you - you can look at your bandsaw and see if you can get a mechanism in place under the table to stop the blade moving back away from the cut, and the top guide seems to have some movement in it too. Probably magnified by the close up of you trying to cut your fingers off. Keep up the good work.
Glenn, there is a ball bearing to take the back thrust of the blade both above the table and below. I didn't even notice the adjustment was incorrect until looking at the video myself. I will have to fix that.
Regards,
Mark
Preso, might CBN be a better choice for the cup wheel over diamond? Diamond, a form of carbon, is known to have adverse interactions with iron.
I will be looking for a CBN wheel in the long term. I have heard that you shouldn't use diamond wheels with HSS tools.
Regards,
Mark
@@Preso58 CBN also grinds HSS with much less heat. The carbon in diamond will dissolve into Fe based tools damaging both the tool and the wheel. Use diamond for carbide.
If I could get any of my drill bits to work properly I would be slightly thrilled. I have mini equipment and if the tool pressure is too high then it becomes defeating. I’m in the process of building something similar to this and hopefully it will work out. I have a drill doctor but I am not too impressed with it.
I have several plastic boxes full of dull and duplicate drill bits that I would love to bring back into service. Individual number and letter drills are hard to find around here too so when I damage one I generally have to continue using it and accept the poor performance. Hopefully this will all change soon.
Regards,
Mark
So I'm guessing that bit you are using to center mark holes is the 4 facet grind you showed at the start? It works very well.
Back when my eyes were pin sharp and could focus very close I used to hand grind all my drill bits and being a jeweler many of those bits were less than 1mm (clearly they were not 4 faceted though hehe). Those were the days :)
Mark I am a new subscriber I like this video I like most other normal guys can't perfectly sharp a drill. Just an after thought, What if a person was to take the eccentric wheel and put corresponding lines on the edge so and put a clicker on it so a person would know if it is on the right angle! just an idea
There will be some engraved lines on the eccentric wheel but I had not planned on making any sort of detent stop for it. That would probably be nice to have though.
Regards,
Mark
12:57 sorry Mark, I was at work (actually doing some work on our ragged out old bridgeport, which is not something I do all the time since I am an electrical engineer ... but I needed to fix my own oopsie) Also are you going to put stops on the end of the extruded aluminum, if so I would not make one permanent ... I have those wheels on my 3d printer and they can dig in surprisingly fast if something jams and produce a flat tire
I will be adding limit stops on the traverse mechanism. I am still unsure if the Vee slot track and wheels are going to be rigid enough but I already had it and it was sitting in a cupboard so I figured it was worth a try. My wheels also came from a decommissioned 3D printer.
Regards,
Mark
Really coming along nicely Mark, were those center punch marks on the triangle piece you were cutting on the bandsaw and if so , why ? Inquiring minds want to know 🤔 .
The marks on the scribed edges of the part are called witness marks. They are light centre punch points and the idea is that as you file down to the line, the marks show up on the edge as small vee notches. It also serves as a datum if the scribed line gets hard to see. You can always re-establish the outline if the witness marks are still there.
Regards,
Mark
@@Preso58 , thanks Mark, great idea I had never noticed that before but one I will put in my playbook.
Mark great job,, I’m not a smart Ass, and only wished I had a mill like yours,,but I do have a Tormek T8 with the drill sharpening attachment and the other toys too go with it at $2 and a bit large ones, but it will do 4 facets regards Frank. Can’t work out how to send a photo of the drill bits
That's interesting. We used to have a Tormek at work and we had a few accessories for it but I didn't realise it could sharpen drill bits.
Regards,
Mark
@@Preso58 But a quick look on internet indicates that the drill sharpening attachment for the Tormek T8 retails for about $580 USD (or about 870 South Pacific Pesos - assuming you can get one locally). I think I like your idea better Mark. I also have a D bit grinder, but think I will follow your lead and build the same project. Looking forward with interest to seeing the completed product. Great presentation as usual.
if you already using 3d printer spare parts for the rail assembly, i hope you used excentric screw on thet wheel oposite to two other like in most 3d printers, because those rubber tires look tough but they wear like crazy when they are set up with a wrong preload and they getting loose with time or start to vibrate
I am still not sure if I made the right decision to use the Vee slot track and wheels. It's a fairly easy retrofit if it doesn't work out though.
Regards,
Mark
it's not going to move back and forth for hours like in a 3d printer
@@fuzzy1dk that's the problem, when rubber stay in one place for long time it likes to take that shape, too much preload and not much use might be the worst scenario
🤣 bad words always help make the situation less catastrophic.
If you want to use a d bit grinder, you can get 5c to ER32 adapters for large drills and straight shank ER11 adapters that you can hold in a 5c for small drills.
how much length does that add up to though (not being wise but I know adapters eat up a pile of space on smaller tables)
The shortest 5C-ER32 I could find sticks out extra 37mm.
I have tried to use a 5C to ER collet adapter but they have too much stickout to work. Also, the standard D Bit grinder collet holder cannot hold long series drill bits since there is no through bore in the collet block. The D Bit grinder is a great machine but it can be quite frustrating at times when you can see the potential but a lack of space or a limitation stops you doing certain operations.
Regards,
Mark
I agree there are there are quite a few limitations to trying this with a standard d bit grinder. I have plans to modify the collet draw nut to have a through hole for exactly the reason you give.
So this would be what is also known as a "split point" drill grind?
No, it is different.
No, although this style of drill grinder is capable of grinding the split point feature on the bit. John Moran's build article details the extra accessory for positioning the drill bit for that operation.
Regards,
Mark
Mark you were extolling the virtues of the 4 facet drill grind but like in most cases there is no free lunch. In my experience 4 facet grinds do penetrate nicely as you say but the cutting tip is much weaker than a conventional grind making them less than ideal for difficult applications. By virtue of the complex facet details these drills are not readily reground by hand. Commercial 4 facet drills have less web thinning, so if you need to regrind with a conventional grind the resulting chisel point is very large.
I have lots of dull and duplicate drill bits that don't get used and they were all conventionally ground bits when I got them. Some even belonged to my father! I guess that as a hobbyist I am not pushing the cutting process as much as a production workshop would. However I would like to be able to use those bits again. It can be quite frustrating to find one bit that cuts oversize or struggles to cut cleanly. As you say, it's always a case of compromise.
Regards,
Mark
as a American chef said to chef Boradi can you can it and so they did and made millions. Can you produce them and sell them. A American asks you.
DISTRACTED ! WATCHED 4 TIMES
Good on you for going back for more!
Regards,
Preso
Why do I hear birds? Are they in cages or wild?
Carl, they are all wild birds. We live on acreage adjacent to a large national park and we are also surrounded by tall eucalypt trees. It's the perfect habitat for local parrots and nectar eating species. We sort of take the bird sounds for granted but I know it is a novelty for some viewers.
Regards,
Mark
@@Preso58 Thanks, Mark. That's quite a privilege to see those intelligent birds in their natural habitat. I guess you get used to the noise.
You know that mst of us don`t care why?