Square Off

[@ShadonHKW]

Hi Tom, My inspection station consists of all shop grade blocks, bars and plates, I just dont have the confidence to label these inspection or laboratory grade, thanks for the fun segment. Enjoyed! Also, any tips on de-magging large items like this? This is a known issue with my squares. Regards, Stan

[@bcbloc02]

My surface grinder has a Neutrofier chuck control that has residual and demagnetizing feature as well as auto release. Do you have a permanent magnet style chuck on yours? I don't notice any residual magnetism in anything I have ground. If you have en electro magnetic chuck you can probably build a circuit yourself to make it demagnetize on its own.

[@aserta]

Check these guys out. They have quite a bit of data on large items degaussing. maurermagnetic.ch/004_E_degaussing_technology.html Also check the term degaussing on google, the data on these machines is readily available.

[@ShadonHKW]

bcbloc02 Mine is a permanent type magnet, they show no signs after heat treat or tempering, so it has to be coming from the grinder mag chuck.

[@bcbloc02]

You might look into getting an electromagnetic chuck as an upgrade, good used ones can be had for reasonable money. You can then build a circuit to alternate polarity and magnitude with decay so as to demag with it. Mine does it automatic upon release and its an old Thompson from the 50's. Alternatively you could send a batch of them to me and I would be glad to run them over the plate and demag them for you no charge. You might come up short a pair of triangles though when you get them back. :-) Brian

[@oxtoolco]

Hey Stan, You can get a commercial demagnetizer pretty cheap. Its basically a big vibrator with an electromagnet. You pass the parts over the top and they are cured. Try travers or enco on a sale. I'll keep my eyes peeled for something. cheers, Tom

[@BasementShopGuy]

OMG Tom, I laughed like hell when you said "let's throw these in the dumpster". As you reached for them, I thought to myself "I wonder if he'll throw something heavy" and you did. BAM! I laughed out loud. So funny.

[@oxtoolco]

Hey Brad, Thanks for the comment. We tore poor Stan a good one on that. His squares are really nice. I have quite a little collections of them now. Cheers, Tom

[@Buckrun11]

I been keeping an eye on Stan myself. Does some really nice work. Hope I can get my grinder working as well as his seems to be. Thanks for the Sine bar demo.

[@outsidescrewball]

Hi Tom.... Enjoyed and very smart (of you) method to teach/show inspection setup and technique......I would bet most people overlooked your intent of the vid. Thank you for the lesson! Chuck

[@oxtoolco]

Hey Chuck, You get a gold star on the calendar today. More to come on the little squares so stay tuned. Cheers, Tom

[@ronkluwe4875]

Tom; In order to really ensure the accuracy of the measurement, would you have measured the sine bar first to ensure that there was no manufacturing variation in the bar? Also, could a half thou be within the measuring capability of the DTI you were using? Just wondering as it seems the difference measured seems to be getting into the range of really precision measuring and would this be beyond the normal shop inspection capability of a machine shop and more into the range of lab grade inspection? Half a thou over 3.5 inches is about 0.008 degrees of angular difference, which is pretty darn fine work for shop grade. Regards; Ron Kluwe

[@oxtoolco]

Hey Ron, The indicator was a .0001 reading test indicator with a .004 total dial reading. At some point you cannot discriminate reliably or do self calibration with the tools used for the measurements. The sine bar and gage blocks are a good example. This is why you have standards and the necessary calibrations that go with that. The Sine bar I used is a commercial bar that has been calibrated in the past. Not recently I admit, (2001) but better than me trying to determine its current state with the same tools. Most shops with careful technique and calibrated tools should be able to get into tenths region without too much trouble. If closer determination is needed then more accurate gages are required. Cheers, Tom

[@briantaylor9266]

oxtoolco Seems to me that another potential source of error, other than the sine bar, is the flatness of the surface plate. The base contact area of the height gauge, relative to the horizontal extension of the indicator, is small so any irregularity in the surface plate would be magnified. Nonetheless, a nice illustration of the inspection technique. Thanks. Brian

[@rchopp]

I think every shop should have a set of those fine dangles, Thanks Tom for showing how to properly check them for accuracy.

[@ckvasnic1]

Mr. Wizard.... How do you check the square side on the surface plate? (Even if the surface plate isn't level) Thank for sharing your time and talent... Chuck

[@EddieTheGrouch]

You are on a roll, Tom. Between Stan's lab grade squares and your "We're going to chuck this 15 ton submarine prop into the lathe." Keith impression I managed to shoot coffee through my nose only twice. I really appreciate the laughs. Cheers

[@oxtoolco]

Hey Eddie, Weekend is here. Maybe we can get a carbonated adult beverage through that nose of yours. Thanks for the comment. Cheers, Tom

[@ScoutCrafter]

Hey Tom! Nice Short!!! Hat's off to Stan... Tom - That DuAll set is just beautiful.. Is that a Bakelite case? Holy crap Batman Black and Yellow! That's one of those items that when you see it you "Gotta-Have"... Next time you pull out tooling like that you should warn us so that we can drool-proof our IPads with cling wrap! ;). Thanks much Tom

[@oxtoolco]

Hi John, Yes the case is Bakelite. Its a sweet little set. I have another but they are Hoke type blocks. Cheers, Tom

[@johncrea9395]

Tom Noticed the Hp11c, great little calculator, wish mine had lasted as long as yours has. FYI, there is a company in Switzerland (SwissMicros) that is making NEW essentially replacements for the HP11c. something to keep in mind if your 11c fails. S, I now have a replacement for my old HP11c, and I love it John

[@billdlv]

Nice job Stan. I would have liked to have seen how you would check the 90°angle.

[@oxtoolco]

Hi Bill, Checking the 90 on these is a bit trickier. But I do think it will make a decent video so you may get your wish. Cheers, Tom

[@dennyskerb4992]

Hey Tom, another interesting video. Great Job Stan.

[@FisVii77]

would love to see you hang out with your buddy with surface grinder to show how to set up and true up that angle :)

[@mikeadrover5173]

As always, thanks’ for taking the time to make this video! And I support this site. ~M~

[@hackenbush23]

Hi Tom, great video as always, thanks again for sharing your knowledge and expertise. Bit of useless information, the process of decreasing a remnant magnetic field is called degaussing. The Gauss being the unit of magnetism. Pete in Australia

[@oxtoolco]

Hi Pete, Thanks for the comment. I am familiar with the Gauss unit in my day job. We set a five Gauss line when we test large magnets. Now I know you will look this up but they are up to 20 Tesla field magnets. Cheers, Tom

[@midgoog2]

Hi Tom The magnetism inherent in the mini squares is obviously an "undocumented feature" from Stan enabling one handed setup in the mill vise etc. My Supervisor in the Metrology Lab gave me a mouthful on day when I rested the bottom of the sine bar on the stacked blocks as you did, so consider your ear as being clipped. Cheers Eric

[@oxtoolco]

Hey Eric, My ear is ringing. Don't tell anybody but my little Doall set is missing the wear blocks. You were probably messing around with lab referecne standards anyway. I would have punked you as well. Thanks for the reminder. All the best, Tom

[@paulpannabecker4641]

Fun stuff Tom, The sound effects department was working overtime on this production. I am going to go watch the Cat Eye Makeup Tutorial to see if there is somewhere I can measure up.

[@tubalcain1]

Tom... just curious what the brand of height gage you are using... looks like a Starrett but I may be wrong.. thx!

[@rskyes]

Just thinking out loud NOT being critical. What's the precision of your table under the two points of the sine bar and along the path that you slid the indicator?

[@rskyes]

Sorry Tom i had not scrolled down far enough to see that you had already addressed those issues.

[@oxtoolco]

Skye S. For reference this surface plate was calibrated to .000022 across the diagonal by Standridge. Yes I got the zero's right. Cheers, Tom

[@rskyes]

Wow, that's not an ordinary table top

[@esoomreltna]

On the tool magnetizer..what is the spring clip (figure "*" looking sort of thing) for? I'd like to buy a set of Stan's squares. Can you pass along some contact info? Thanks. Eric

[@oxtoolco]

Hi Eric, Not sure what the clip is for. I have not tried the easy button yet. Stan has a channel as well, If you ask over there or PM him direct you might convince him to make more of the little squares. If he doesn't cooperate let me know and I'll harass him a bit. Cheers, Tom

[@JohnBare747]

Happy hour at the sine bar...

[@TrevorDennis100]

LOL very good John. 😂

[@razorworks9942]

Tom thanks for the laugh at Stans expense! Half thou is plenty good for anything I'll be making!! Let me rephrase... it'll be a cold day in .... before I'll be holding those tolerances! Ray..

[@sblack48]

Oh man those aluminum squares are nice. He went to a lot of effort to make them look grody. A cracked up! What did you do to your right hand?

[@HMartins-351]

Hi Tom Looks like you forgot the granite flat stone in the final credits screen. Henrique Martins Portugal

[@joshtaschuk2153]

Hahaha, I laughed out of my seat when you put that oily rag, saw cut angle on to check it. HA

[@BleuJurassic]

must have missed the hippopotamus Giggles great inspection video

[@carryitaround]

did you sweep your set up? i didnt see it

[@oxtoolco]

Hey Carry, I didn't sweep the sine bar on camera. Missed that one. We will come back to the saga of the little squares. Cheers, Tom

[@fuzzy1dk]

you should have tried sweeping the sine bar ;)

[@oxtoolco]

Hi Lasse, Pretty boring video. Watching the needle not move. However I agree it would have been more rigorous. All the best, Tom

[@rexhaereticus2468]

i like how you couched it with, "see a little differently". yeah, not better though, heheh.

[@MrJugsstein]

going back looking at your earler stuff. still laughing

[@oxtoolco]

Hi Will, Well at least somebody is digging around in the archives. Thanks for the comment. Cheers, Tom

[@MrJugsstein]

Enjoying the old as much as the new. Also thanks for interducing Robert. I Watched Adam sorting your shaft the other day. Looking forward to seeing the next step. I really like how the group is working to pass on the knowledge.

[@intjonmiller]

I'd hate to see your treatment of a guy who didn't send you gifts. :) Thanks for the awesome inspection lesson, and many laughs. Tri-Dangles. Ha! :)

[@oxtoolco]

+Jon Miller Hi Jon, Stan and I have a mutual harassment program in place. Thanks for the comment. Cheers, Tom

[@CompEdgeX2013]

Did Stan use the aluminum ones for surface grinder setup?? :-) Either that or that el'cheapo surface plate came from a dumpster dive.....lol Just kidding as usual... I'm very much liking those squares Stan, awesome job buddy! OH ya, nice weekday short too Tom. Colin

[@spinyheghog]

Your triangle is out about the same that his surface grinder table is.

[@manudehanoi]

how do you know and check your stone table is more accurate than the 13um/90mm deviation you saw ?

[@oxtoolco]

Hi Manu, Good question. The surface plate has a calibration sticker on it and was calibrated and repeated full length flatness measurements to .000022 inches. I have no way of checking this myself so I have to trust it at some point. Cheers, Tom

[@manudehanoi]

oxtoolco thanks, maybe it would take a laser to measure this kind of accuracy. But maybe there is a method to test it with a micrometer and get confirmation in the micrometer range.

[@sto2779]

4:00 - wow the crap machinists sends to Tom for laughs... tom could turn those triangles into hundreds dollars precision triangles.

[@stephensmith8756]

Tom Stan's little angle plates might be more accurate than your test showed. sin 30 = 0.5 is only an approximation, the same as the 1, 2, square root 3 is for a 30, 60, 90 triangle, and 22/7 is for pi. Try using 2.618" for the gauge blocks instead of 2.500". This derives from using 3.14159 for pi, so (( 30 x 3.14159 ) / 180 ) x 5" = 2.618" ( to 3dp ). The difference of 0.118 over your sweep of 3" equates to about 0.0004", so that might be your 1/2 thou ? Regardless, your test showed Stan's work to be an outstanding achievement ! Regards

[@stephensmith8756]

Tom Mea culpa. One crucial step omitted from the Excel workings. Cheers

[@blakewilson3877]

is this a joke?

[@blakewilson3877]

sin(30)=0.5 is not an approximation, its exact. You really shouldn't post bad math on here.

[@ironmecanic]

the smal angels intrest me weher can i find stan tom =)

[@oxtoolco]

Hi Mup, Stan has a KZbin channel called Shadon HKW. His company is called Bar Z industrial. Cheers, Tom

[@ironmecanic]

ty

[@Opinionator52]

Hi Tom, That was fun, Stan definitely did a good job the (non-joking squares). But I think he deserves a bit more credit on the rag... I have made some of them myself and to get so much weight and at a glance not be dripping and gooie with axel lube takes skill! Not to mention a dose of mega-thrift... ;oD O,

[@davelowe1977]

Anyone who can make an instrument that is accurate to +/- 0.00382° gets my respect! Peace

[@franksalterego]

You could lap the .0004 out on a piece of 600 grit wet or dry in less than a minute.

[@gregbrodie-tyrrell3473]

Half a thou out? The belt sander will fix that real fast!

[@oxtoolco]

Hi Greg, I think just walking up to the belt sander would scare those little squares straight. Cheers, Tom

[@EnergyFabricator]

Stan, Stan, Stan! :)

[@dizzolve]

Tommy - mwalolol

[@caseman2294]

Everyone just unwind your caniption...

[@richardshephard5335]

you engineers are very sloppy, half a thou? we kerb layers have to be "spot on" lol