I really appreciate the lack of crass and crude language on this channel, very respectable

I am continually blown away by how much you and the other guys know and your attention to detail. I think there should be a "Machinist Hall of Fame"! Your pool of knowledge is priceless. Thank you Tom

OMG .. that gauge! Great detail and great show.

As always, precision eventually come from attention to detail. I have the greatest respect for people working in production using methods based on high levels of automation, but you and others in this group are building a knowledge base that is priceless. When it comes to making the machines that provide efficient production there is still someone at some point who is willing and able to "fuss" with them to get them out the door.

Another great video Tom. Surface grinding seems to be one of those subjects that is getting harder and harder to find good information on. Thanks for your efforts and dedication to teach some of us newbies a thing or two that we might not have otherwise had the opportunity to learn.

Tom, you are human, thats a good thing. It keeps me watching. Thank you for the hours of time put into these videos. They are so relevant for shop work they could be training videos for future generations. They may even be used by Mars colonists as this century continues. On Mars people will have to obtain skills from someone or source and it may be you. I know, sounds futuristic, but so was a trip to the moon in July 1969..

I'd have to vote this as your best grinding video yet Tom. Extremely informative and very much appreciated. First time I'd ever seen those temperature tapes as well. Yourself, Stan, Chuck, Don at Suburban and a few others have vastly increased my knowledge about surface grinding so far. I've got a Mitutoyo branded millimess indicator that's good to the nearest 20 millionths that I thought was pretty good until now. And while it's got the Mit. name on it I'm positive it was built for them by Mahr. It's not even close to being in the same ball park as what you have tho. But your certainly right, getting them set on the zero mark can be more than a bit frustrating at times.

OMG, you make TOT look like a carpenter! (no disrespect TOT, just playin'), Subscribed!

Wowwwww Tom! I I love so much when you go in this type Of technical détail and precision. As i read the comments you lift passion and a lot Of interest about precision ans measurement. You are such a Great teacher! Good job Tom !

Excellent, Tom. Good to see my rants on the effect of thermal expansion on precision measurement unimpeachably confirmed. Them millionths stack up, whether a micrometer in a warm hand or straight railroad track in hot weather.

Great video. Getting ready to do go through the same exercise on a electro mag chuck and this will really help me. Thanks..

I can't pat my head and rub my tummy at the same time, so I don't think I'll invest in a surface grinder :) Great video again, Tom!

4:40 At the rifle range where we shoot Anschutz target .22 rifles for competition, during practice nights the sound of a 4mm allen key hitting the floor is by far the most recognizable sound there is. Followed by getting out of position to pick it up off the floor.

Yes Randy "way wear". Tom always getting so fantastically serious! I was thinking even thicker film of way lube on one side than the other. Great video Tom

Of course I knew about heat expansion, but I just saw it for the first time "live". Very cool and thank you for showing it.

Nice buddy, I'm glad I don't have that gage you do I would probably need to be committed. I get mine to 50 millionths or better I'm happy. The block test is the way most manufacturers recommend you test your chuck which I never knew until I did my big wet grinder 18x24 they showed that in the manual. We were taught to use Crisco never understood why I use cool mist and I love those blue Norton sg wheels they hold the edge better than the white. It's awesome to see this stuff demonstrated brings back the mold shop memories!

Cool demo of heat expansion. Makes a lot more sense when you can see the results.

Great video! Thanks for taking the time to show all the important bits and go into such detail.

Oh how nice! As soon as you started grinding the blocks and talking about very accurately measuring and comparing them I thought "Well that would be a PERFECT example of when to use a CEJ Mikrokator (comparator)!" And what a nice surprise just a short time later :)

As always very informative and that indicator is jaw dropping accurate!

You have some very high precision tools there. Thanks for the great video.

Great video Tom, Its always interesting to see what simply touching, holding the object your measuring or the measuring device itself can have an effect. Matt C.

Great stuff, talk about attention to detail. Thanks, Harvey

Very nice video, Tom! I'm learning...

Exactly the knowledge I needed. Thanks Tom.

always enjoy the new videos Tom ty for sharing

Great video Tom, it was interesting during the 5 block cuts, the blocks closest to you appeared to have a louder/larger spark trail along with a startled grunt/groan from you....your testing showed that as the center block was low which is why the change when you got to the outside......

Watched a different Video, he said to make sure the magnet is ON for this. You did good, had to come back and check.. He also talked about the temp of the coolant. Same deal as temp of the spindle being stable. Had not thought about that, but every tiny thing matters.

amazing to be able measure with such precision

Love anything grinding. Thanks tom

Thanks for showing the test block grow. I was hoping you would do that.

Nice job Tom. Breaking out the big gun metrology equipment...

And it _was_ neat to see the size/temperature demonstration.

The temp strips are neat, but i like to see temps from more than one spot so my neat trick of the day is: PC temp units. You buy those and stick em in the old DVD CD hole in a PC tower, they come with (in my case at least) 6 points to read your temps and some even have controllers for fans. Happened to have one from an old PC. Now it reads the temps on my mill, plan to get another for my lathe and my welder. The fact that the LCD is backlit is a bonus, you can even set temp alerts on mine.

Interesting device. Scary accurate. I had to google it and figure out the Abramson movement.

Nice demo on the process so far.

oh my.... that indicator is cool ..... great video, thanks .

We used to have a bit of coolant dripping on it. Good vid, thanks

That gauge is just amazing! I would love to see you take one of those blocks or something and take like one stroke with a file and see how much material does it remove, than with a scraper. I think that would be interesting to see.

Now that is precise .. Right on tom , Thumbs up man !!

It's interesting to watch the reflection of the shop lights in the surface of the chuck as you are grinding the five blocks. From that it appears that there are some low spots near the front.

Tom, I know this is an old video. I don't know if you even read the comments from it anymore. I'm trying to learn some things about machining, in particular, precision grinding. Could you do a video about wheels? In particular how hardness and grit interact with each other and how dressing different hardness of different grits with different types of dressings effect accuracy and surface finish. I think this would be a very interesting video and it falls right into your scientific wheelhouse. Thanks, Chuck

glad I found this one I just bought my first surface Grinder a Boyar-Schultz Challenger Im having to do just this.

Tom, Thanks for the video, I recently purchased a Boyer Schultz 3A from a friend and will be going through this soon as I set it up. Want to rebuild the hydraulics also. The friend suggested grinding the mounting base then the bottom of the chuck then the top of the magnet, not sure if it will make a difference. He works for your friends at Advanced Grinding btw.

good video thanks Tom

Those clamps are works of art! The video has been up for a month so I guess it's old news and a long time resolved, but I'd guess the chuck was getting heat in it to keep coming up hollow like that. It doesn't take much! It would be interesting to hear the end result.

Great video. Thanks for sharing.

Fantastic video Tom. Keep up the great work. Learned a lot. Thank you !!!

Thanks for the lesson Tom!Now that I have a couple grinders, I can pretend that I know what I'm doing!!

very detailed and I learned a lot , thanks

if I hold my hands on it too long, the thing will start to grow. lol you're so funny Tom

cool. If I may be so bold to suggest you tag the equipment you use, in the description; it will help people find the awesome content you have ;)

😂😂😂😂😂 You scared people with that gage. Thanks for the fun, Tom. John

Your sick, and I love it. Millionths and I was on the edge of my seat. My wife says I'm addicted to tool porn, thank's for delivering.

For those of us in the home shop, what kind of accuracy could we expect from our surface grinder in our garage? I've got a Harig 612 and I can't find any stated specs on how accurate it should grind.

Wow Tom that's cool. Well I'm crazy enough, I don't need anymore help with a millionth gage. LOL. Great video, thanks

How did you know I was screaming hold that in your hand for a minute I wanna see it grow"?Haha.

Thanks, Tom

Physics teachers should use that gage to show thermal expansion. Great teaching aid.

I think number three was lower because you went back and forth much quicker then on the outside blocks, making it hotter while grinding. I noticed that allready while you were grinding, and thought you had to wait a little longer after each pass on block three in order to match the grinding pace on the outer blocks. cheers.

we have a little puller for our surface grinder mandrels that only has a hex on the end rather than a handle I like to just screw it in till the stud touches and tap it sideways. pops right off.

Tom, you have the patience of a saint!!!! However, given all the external factors (ambient temperature etc) what is your position on 'ABSOLUTE'? Kindest regards from Bonnie Scotland and thank for sharing your vast knowledge young man. Joe.

Just gotta love the "degree" of accuracy! When yer hot, yer... lol Cheers.

Cool video Tom thanks for sharing, great ending ;-). .Me

The block test is great for a newer grinder, but how would you test for wear on the ways of an older grinder? I would imagine something like a long parallel (upright), which would then be compared to a surface plate. (My second time watching this video now that I have a surface grinder)

Great video. Thanks for posting. The 5 point test is a pretty cool idea. However, it wouldn’t have found the hole you were showing around 20:42 in the video. Right? Or is it only intended to measure the flatness after you’ve ground it down ‘flat’?

keep up the good work. with the middle one being hi could one say there is wear in middle of the bed ways as you did not use the full travale to do # 3?

Hi mate. That is a wonderful gauge you have got there. I wonder if you can get those angle blocks out and show us the one second one. I was wondering, you knew that you had a dip in the front of the magnet, why did you not put an extra block there? It would be handy to see if you had removed that dip adequately, not?

Nice one Tom, Cliff

Could you do a video explaining the process of surface grinding a angle plate... Were grinding angle plates at school and where having a hell of a time getting all the sides to come out perpendicular...

Holding .00002 will we see a line of Ox tool gage blocks? :-)

Tom did you end up grinding the fence in another vid?

Very cool! When you were roughing the chuck how much did you take off and how much during finish passes?Thanks for doing what you do.

I enjoy your scientific approach to machining Tom!! Is this your highest resolution indicator in your shop? What is the next step up from there with measurements?? Id love to know.

Is the reason the center block came out larger because it was in the center mass of the magnet which may be cooler than the outside edge's ?

Interesting to watch, how precise you can go in the shop. Is the next step a temprature controlled room?

Tom wasn't eating paste in grade school... he was at the pencil sharpener working out feeds and speeds.

Hi did you ever do a video on tilting the grinding wheel

Hi TomLove the five block test. Makes a lot of sense. Can you please tell us what brand name your balancer was and where we might be able to get them. Looking at Sopkos on ebay but no luck.

Antimony expands when cooled, that's pretty damn nifty.

Tom, Great Vid Thank you. I have a question, When traversing the Surface Grinder bed side to side and then Advancing your work piece "Bed" in &/or out for the next pass. Does it matter in relation to the Spindle/Stones rotation to the feed direction? .. Kind of like conventional Milling too Climb Milling. Does this matter in a Surface Grinder &/or could it provide a better surface finish when Grinding in one side to side action? It seem like you where grinding on both side to side actions. .... Love that Gauge, Guess you could use chopsticks to move small pieces around and still have thermal isolation.

31:48 all grow with heat. Except water

Great-Great video thanks Tom

Hey Tom, great video and I loved the part where you illustrate the fine resolution of the human eye in seeing the shallow dip in your mag chuck(did someone say Chuck?). I also have a question for you, am I correct in thinking that 20 millionths of an inch is equal to 2 one hundred-thousandths of an inch? It sounds stupid as I ask it, because that's what my decimal place mathematical learnin' tells me, but I never hear it said that way in Metrology. Is that just because it's a mouthful, or is there another reason? Thanks and I hope you all have a great weekend. Aloha...Chuck

Awesome indicator and show! I would hate to guess what that thing cost............We have a clapped out Chevalier 12x24 with turcite ways at work, Its a POS if you need to do anything even slightly fussy you have to grind the chuck but its hydraulic with easy to set stops so you can sit back and watch LOL I'm surprised your Taft Pierce doesn't have Y axis auto feed?The crappiest grinder I ever ran had that?

Ok dumb question, but isn't the wheel diameter ever so slightly less once you get to the end of a pass i.e. Once you get to the edge of the table closest to you? I guess you minimize this by taking very light cuts and taking large stepover but is it a concern? P.s. I know diddly about this...or did you already guess :-) great video thanks. I am seeing the price of machines plummet around here so I am on the hunt for a small SG so I am really enjoying these videos and Phil Kerner and Don Bailey.

Bravo Maestro. One millionth of an inch is 25 microns. Now, my puzzlement is this: it is an abrasive process. So every pass you make, the wheel has to get smaller. Question is how much. Of course the wheel is much harder than the metal. So it will wear down much slower than the metal. You block test seems to show that the ends are within say 30 microns in Y and X. Is there some kind of guide as to which hardness of wheel you should use for a given amount of accuracy?

Hi Tom ! That last 2-3 mill. is what we over here calls ... "mosquitofucking" (= dirty word for "hair-splitting") Anyway some nice instructual video - thx for sharing.

Won't grinding the magnets provide enough of a mechanical shock to demagnetize them? Or are these not the super high-powered rare-earth magnets that do that?

Must have had a tremor over there on the coast and horsed up a measurement? Fussy stuff... :-) Colin

Is that big building you show all the time, - your shop?

Great show Tom. What brand straight grinding wheel do you like/are using.

What would be the thinnest you think you could grind something? How would you go about holding it if it was something like a brass shim?

The ends justify the means?

I'd like to see you run those numbers written in sharpie under the comparator!

no auto feed on that grinder?

had a co worker once who would hold apart for inspection and gages would read off because of his hands would make the parts very warm.

Did any of Tom's regular viewers think for even a minute that he was going to let that error slide without at least trying to grind it out?

Nice video! but what happened to the meatloaf series? I am hungry :(

good video. how long will a typical chuck dressing last? assuming you dont move or physically damage it, what would cause the chuck to need redressed again? when your dealing with millionths i assume that feeds and speeds on a manual machine could cause that much variance. your climate controlled inspection room cant be far off.