SURFACE GRINDING part 2, accurate grinding, squaring up a block & completing a project

[@MustacheKid23469]

Thank you, I'm a 7 month apprentice and your tips helped!

[@f.g.hammer6814]

Thank you Marc. Your channel is my favorit, for the weeds machinist that i am!

[@davidharte4703]

Top Bloke giving some very important safety tips.. Surface grinders can seriously cause alot of damage to you. I've seen elastic wheels fly into the roof..The chap forgot to put wheel collar on.... I've seen this happen a couple of times...A wheel, elastic wheels tend to skid on magnetic chuck then shoot straight up vertically...they will go through most factory roofs or lodge halfway in roof...Alot of spline grinders (surface grinders converted with index heads, centres etc)...use small wheels which will explode under load when grinding.....they also tend to end up in the roof...wakes you up big time....

[@michaelwright729]

Great pair of videos. Thanks.

[@terryisaac8195]

Thanks Marc!!! There are many varieties of training videos available on KZbin, but I must say that all of yours are very concise, very complete, very informative, and very entertaining!!! Kudos and Great job, my friend!!! You and I are about the same age, so please take all necessary precautions against getting COVID-19. I certainly am in a cautious, but far from a panic mode. In one of my Logic Classes many, many years ago, I was taught that there are Lies, Damn Lies, and Statistics; (and in today's interweb virtual universe: Alternate Facts(?)!!!) I think my head is exploding!!!!! Have fun, stay safe, be well!!! Terry

[@MawoDuffer]

These are really good videos. I would like to add a few things. At 5:53 you can also do this technique with a grinding vice. This is a good way to clean up and square those two sides. When you rough cut on a manual grinder, you can use only the front edge of the wheel. Then on your finish cut you can use the back edge of the wheel which is still sharp. I assume you probably went over a lot of stuff with your students about heat and how to smoothly operate the cranks on the grinders, but just didn’t cover it in this series.

[@guillermohernandez3252]

Thank to you for take time to riding all information and make safety videos Marc and thanks to the team whose help you make happen

[@chrisroulston72]

Thanks again for a great video Marc!

[@stephenmale4492]

Wise words Marc. Thank you

[@harrisonaero]

Nice job Marc- really informative. Subscribed.

[@jkopel]

I am about ready to start using a grinder I have been rebuilding and this kind of basic process and safety related info is exactly what I need. Thanks for all the great videos!

[@DR-ru9cx]

Hugely helpful!

[@Beechdrvr]

Nice job Marc! Great tutorial.

[@theradarguy]

Great video, Mark. Could you make a third video dealing with sparking out and troubleshooting surface issues. Thanks.

[@fordcar8691]

I use precession vise to get 90 degrees the material and then finished squaring ..very easy to use it no need the to hole the materials

[@outsidescrewball]

Enjoyed....good lesson

[@jeffhulett4194]

I wish I could afford a grinder to practice on, thanks for posting.

[@dekutree64]

Replace the switch on that machine with a single pole double throw, and wire it up to connect a power resistor between the motor wires when turned off. That will stop the spinning much faster.

[@zHxIxPxPxIxEz]

You don't want a fast start or stop. It will throw the wheel out of balance. The ideal setup is a ac frequency inverter. You can program start up and down speeds. Moreover, you get rpm control of the wheel. Which DOES matter once you get into serious/efficient grinding. Say, use of super abrasive wheels. Supper abrasive wheels are much MUCH more easy to shape at low speeds. If you hold a diamond wheel in your hand you can cut it with a file. Now try that when it's spinning at 3250 rpm. But yes I like the simple solution you purposed here. It's easy. But my option is, every grinder should have freq inverters installed from the factory. Anything less is just cheap and poor machine tool design (baring old tools that did not have the electronics available to do this) thanks, and happy grinding! May your work be ever more flat and on size.

[@charliesteel8750]

I love your videos and I bet you would cry if you saw how we use our small manual surface grinder at work. Hahaha when time is money, the wheel barely ever turns off

[@life.is.to.short1414]

I'm guessing since you ain't using coolant, so you can stop the wheel?

[@songwriting1se463]

Sir depth of cut kitna dena hai

[@donmittlestaedt1117]

Thank you

[@eddiekulp1241]

You will wear your arm out using that manual surface grinder all day , small jobs allright . We had a big mattison 48× 14 inch chuck

[@deangiacopassi8757]

Great videos except for the clarity. Could you upload in higher resolution.

[@eduardosampoia5480]

Would you like a massage with that? The videos are first class.

[@FrancisoDoncona]

As he said, filmed earlier not intended for KZbin as it predates his use on the platform probably done on video tape. Video tape is what we used after our parents used film and their parents used their imagination and sound.

[@ProfessorMAG]

In your opinion, what is the cutoff Rockwell hardness for grinding?

[@charliesteel8750]

There is no cutoff, just use the appropriate wheel, there are a few

[@jerryherrin6470]

My hand has smacked into the corner of a spinning grinding wheel on a CNC OD grinder before. I jumped higher than Michael Jordan ever could.

[@shannonsears3496]

Everything this guy does is wrong, Just the opinion of over 30 years grinding. One example is his breaking edges. They should have been broke before heat treat. Stone the chuck. Do you own an indicator? I see you have a surface plate. My grinder stays on from the time i enter the shop until quitting time, unless im changing a wheel. Why such aggressive cuts? Your making tooling to be used for a lifetime, not trying to make the best time on a job in the shop.

[@reallydonotdo]

Then make your own video and quit talking trash about our boy Marc. Lets see what you've got. Being as sharp as you are, you missed that he is a teacher and producing videos from that perspective and not one of production. Remember this. No one knows your name or your work. We know and love Marc for his.

[@shannonsears3496]

he teacher part is scary. People shouldn't try and teach what they don't know. @@reallydonotdo

[@julian089]

It isn’t 7.8” of an inch…. That’s super super misleading, it’s .0078”. Also why do you stop the spindle after dressing your wheel… you’re completely undoing what you’ve done, by dressing the wheel…I’m just confused. Any good toolmaker I’ve worked with always keeps the spindles running all day once the wheels are dressed.

[@TheLiddokun]

He said 7.8 thousandths of an inch. This is correct and well accepted way of saying it in many industries. Turning it off doesn't ruin the dressing, not sure where you got that idea. Maybe because the machine needs to warm up to operating temperature so it's stable, it's already warmzl,.so it's okay to turn it off for a minute before turning it on again