How to Jig Grinding Two Critical Holes On A Taft-Peirce Bench Center

[@chrisstephens6673]

I love watching professionals work, YT has so many amateurs who think they have learned something and put up a video to show off their new skills, whether they really know what they are talking about or not. Keep up the good work.

[@SuburbanToolInc]

+Chris Stephens Thanks, we truly appreciate your support.

[@stacysimon8864]

Mr. Bailey, I am ever so impressed with your KZbin Series. Thank you for doing this. My point to impress on you is that you are truly a Master of the Trade. I've paid my bills by making chips for over 20 years, yet I can watch one of your videos and learn something new. Thank you again, Stacy

[@SuburbanToolInc]

+Stacy Simon Thanks for the support, glad we could help you learn something new.

[@RyanWeishalla]

Thanks for sharing. That jig boring process is cool to watch and learn about. It would be interesting to see how your surface grinder set up the part to be perpendicular to the line of the two holes and a specific distance from the larger hole.

[@SuburbanToolInc]

+ILGopher Thank you for watching, and for the comment. We'll take that into consideration.

[@Bespoke-metal-fabrications]

This series on jig grinding is amazing. The Moore tool company have a great book 'Holes, Contours and Surfaces' that demonstrates some of the amazingly accurate and complex work that can be done using jig borers/grinders by experienced operators.

[@SuburbanToolInc]

+Bespoke Metal Fabrications Right you are. What we're doing on the jig grinder is pretty fundamental, it's truly amazing what experienced operators can do with the machine. Thanks for the reading recommendation.

[@bstevermer9293]

Bespoke Metal Fabrications That book is worth more than buying a used jig grinder.

[@Hirudin]

Another great video, thanks! I like the voiceover format, it worked well for this vid, in my opinion.

[@MrShobar]

Don, you also don't want to torque down on the workpiece too hard because you don't want to induce elastic distortions while grinding. Great work as always, my friend.

[@bcbloc02]

I agree with you that the jig grinder is the tool for doing this kind of work. I will say that I had a a Mazak sales guy tell me their cnc machines can hold .0002" all day long. He may not have ever measured any parts that came off one though. lol

[@wheredidmyhammergo]

bcbloc02 To be a salesman is to be a storyteller.

[@bobjimenez4464]

yup and the man with the money will buy the mill and be sitting with pallets of non-conforming parts within 6 months......Bankrupt one highly esteemed mill programmer argues that nobody has equipment capable of measuring the tolerance......lol Zeiss Prismos Baby and there are lots of them

[@scottmuller1901]

Great video Don!

[@eddiekvh]

So much knowledge, and this machine is amazing. If you ever need a apprentice let me know! lol

[@sblack48]

Never seen or heard of this machine. Very cool! Thanks for doing this. I'm less dumb than I was 20m ago! :-)

[@larrysperling8801]

great information. thank you

[@SuburbanToolInc]

+larry sperling You're welcome, glad we could help.

[@extradimension7356]

Would love to see more jig grinding videos ! Do you guys have the Moore spintable ? Some really cool stuff you can do with a spintable and a moore sine plate... Thanks for making this video !

[@turningpoint6643]

OK I own some of the Moore books so have seen some pretty complex parts that are shown in them and what there grinders are capable of in trained hands. And maybe that is pretty simple work for a jig grinder, but so far your videos showing that Moore JG'r in operation are the only ones I've seen about a tool I can only dream of having. So from my perspective there more than a bit interesting. It's also nice to see what goes into building the tools your selling as well. Personally I think most high quality manufacturers are missing out by not showing the fine details about what makes there product worth the extra.

[@SuburbanToolInc]

+Turning Point Thanks for watching, I'm glad we can provide unique and educational content for you.

[@davestrong6472]

Great video, love the shameless advertising on the box of gauge pins. Can we do a video on scrapping?

[@SuburbanToolInc]

+Dave Strong Take a look at our video tour of Plason Scraping: kzbin.info/www/bejne/iHbIeKFqnbNkeMk. The great guys at Plason showed us the entire process of rebuilding a machine using the hand scraping method.

[@Eggsr2bcrushed]

9:27 PIZZA DELIVERY FOR DON!

[@SuburbanToolInc]

+Eggsr2bcrushed I wish, Glenn was trying to make me jealous.

[@kurtfromMichigan]

I miss intricate jig grinding. When I first got into the trade I used to jig grind alot of trim edges on die details. Grinding all the radii, then turning the job on angle and chop grinding between said radii. It took skill and patience and was fun. Now I feel like all I do is grind the holes the cnc dept cant circle mill lol.

[@paulrjones3]

Fascinating and very instructive video with all the close-up shots. I noticed in some of the up-down grinding oscillations you have the grinding stone sweep oscillations in the counterclockwise direction and other passes sweep in the clockwise direction. Is there are reason for doing both directions? Thank you for the excellent video and voice-over instructions.

[@SuburbanToolInc]

+Paul Jones It only oscillates in one direction, what you're seeing in a visual illusion created by sped up video. Good eye and good question, never noticed that before.

[@russgray1082]

I recently purchased a Moore #1(I blame you for that). Pretty much like what you are using, some of the controls are placed differently. I've been attempting to learn to run it. My question: around 7:50 you talk of placing the fine adjustment around neutral. Are you just putting it in the center of travel? And why.? I have always started with the fine adjustment almost all the way up (counter clockwise) thinking I then have more adjustment available. At 8:20 you say adjusting outward but you are turning the fine adjustment counterclockwise...shouldn't that adjust it to smaller dia? I realize the over voice may be hard to match to certain things. Is that the case or am I starting out with the fine adjustment wrong?

[@SuburbanToolInc]

+Russ Gray In regards to your first question; yes, I am putting it in the center of travel to give it maximum movement. Your method is also a perfectly acceptable way of doing it, personally I just prefer the neutral position.

[@bikefarmtaiwan1800]

Such a wide variety of talents you have- super modest too! Excellent work of course. May I ask why the helical angle of the large bore grinding set up was so steep please? Was that due to the grinding wheel used, compound and diameter of that wheel ? Reminded me of the angle of attack in honing cylinders. Thanks for the videos you post.

[@JackHoying]

Interesting work! Can't believe you rejected the pizza!

[@SuburbanToolInc]

+Jack Hoying It had anchovies on it, not for me.

[@themachinist6554]

Great machine but shall be operated only with pro, many setting there and zero mistake required. Btw what is the relation between the wheel and the hole diameter, maybe can called ratio?

[@SuburbanToolInc]

+The Machinist That’s a very good question. While the ratio should be considered, it’s not critical. As you can well imagine in the case of Surface or O.D. grinding, the ratio is in material (in most cases). In the case of I.D. grinding, the I prefer to find a wheel that I feel comfortable with for the specific job.

[@offyguy112]

I like the jig grinding videos Don. I'm surprised you didn't paint the parts first then finish grind them. How do you keep the precision surfaces free from paint? I'm assuming you tape them, paint them, then scrape any over spray or bleed through with a knife afterward? I've been rebuilding and repainting some of my machines and accessories, and painting around precision surfaces always takes alot of time. John

[@SuburbanToolInc]

+Offyguy Correct, that's exactly how we do it.

[@johnreese3943]

Was that a Harbor Freight workbench in the background?

[@SuburbanToolInc]

+John Reese Yes it is.

[@kellysampson5984]

Thanks Don, Nice video enjoyed it very much.. M.K.S.

[@SuburbanToolInc]

+Kelly Sampson Glad you enjoyed it, thanks for watching.

[@EdwinvandenOetelaar]

Hello Don and the team, thanks for making yet another interesting video. I do have a question about finding the center of the first hole you are grinding. How did you align the head to the X-axis? (center finder touch off? How does that work with this oscillating head?) I can understand the Y-axis because of the fixed angle block and the other hole, because it is relative to the first.

[@SuburbanToolInc]

+Edwin van den Oetelaar I just used the grinding wheel, put it in the oscillating position, and turned it on. I started to grind until it hit all sides.

[@duobob]

Nice work! Now show us how you make the second part match the first...

[@ny0607]

On my apprenticeship the journeyman I worked for always said "tight is tight"

[@phillefever1934]

And why wouldn’t you surface grind the bottoms of the feet prior to finishing the bores? They are the reference on which the rest is based

[@thundercuck1779]

The bottoms of the feet were ground, parallel and square and used as datums, however excess was left on, so they could hone in to the correct distance. It's faster and easier to grind the feet into tolerance with the finished bores than to grind the bores into tolerance with the finished feet. The latter requires more time and a perfect set-up which can be a little tricky to measure

[@joshua43214]

Who wants to take bets that when he handed the part off to the guy who grinds the feet, that it got "accidentally" dropped and had to be remade? :) I used to work for a guy like Don (his name was also Don), and we always snuck around behind him to make sure he did the job right anytime he came out in the shop...

[@anusuktrongdee7771]

How to work with a centralized jigsaw?

[@jfpinkston1]

Great video as always! You seem to slide in a bit of aviation phraseology ....are you a pilot?

[@SuburbanToolInc]

+jfpinkston I do have my pilot's license, haven't flown in a long time though.

[@johnreese3943]

Don, You are using diamond to grind ferrous metal. I had been taught that you do not grind ferrous metal with diamond because at high temperature the iron absorbs carbon, making the diamonds disapper. Was I taught wrong?

[@SuburbanToolInc]

+John Reese I have not shared that experience so I'm not sure how to respond, but the diamond has always worked fine for us in this application.

[@wheredidmyhammergo]

Diamond does dissolve carbon into steel during high temperature grinding. This operation may benefit from from a cbn wheel, but why fix something that is already doing a great job? I love the series and learn something new ever time. Thanks!

[@richb1334]

i think the hammer is the best size for the job I will make one for my self

[@bobjimenez4464]

the new generation of machinists believe that precision bores +/- .0001 dia can be generated with an endmill. also the endmill is dull beyond use when the tiniest amount of coating wears off of the cutting edge. yup.....ignorance runs rampant when unchecked.

[@kurtfromMichigan]

"Just circle mill it" hahaha. Too true my friend

[@Slonya23]

Your oscillation speed is way too slow, you should be running double that speed. Also I believe you make this look easier than it is. It's extremely hard to catch .0002 size with a diamond wheel since they are too coarse, you'll need a borazon or aluminum oxide. The wheel you using is too small for the bigger hole and again your head is spinning way too slow. Any pickup should be done from the head of the machine, not the body. you need to use 2.25" indicator holder clamp and that's how you find center and/location.