This seems pretty advanced; I hope reading a tape measure is a prerequisite. I'm 61 and would like to retire in the coming year but am reluctant to do so until the next new hire we take on can read a tape. Back in the 90s one guy I worked with could only read a tape in sixteenths. It stopped me in my track the first time he gave me a measurement of 12/16. Twelve sixteens would have been a great shop prank but he really couldn't read a tape in halves, quarters, or eighths; so I adapted. Currently my coworkers get a deer in the headlights look on their face when ask to check a length for say 33 'n 15/16.
I have a video on that: ua-cam.com/video/j1Nm27LTkIQ/v-deo.html Feel free to use my free curriculum in your training guide. (I have grade 12's sharpen lathe bits)
When I was teaching at a trade school, we had a few students who couldn't tell the time without a digital clock (couldn't use analog) Luckily, not too many in the 11,500+ I taught as I had to teach measuring, feeler gauges, snap (T) gauges and ball gauges, vernier calipers and micrometer use (metric and Imperial) in the days before 'everyone' used $10.00 'Made in China' electronic calipers I did manage to get 128ths of inch vernier removed from course as I had never used one in almost 30 years since I trained (although they are/were used a lot in woodworking I believe?) I'm a bit older than you and switching from inch to metric is a little more challenging since I stopped teaching and using it 'everyday'
Hand them a set of standard dial micrometers with a Vernier scale instead of a digital readout, they are freak'n lost ! Even some coming out of community college with a degree in machining !
I used whatever came on the grinder. A finer stone will give a better finish, however. in the school shop I stick with the more coarse stone and put up with a less-than-optimal finish in the interest of stone longevity with all the other grinding it gets used for.
@GregWellwood thank you! I have a lathe but have been using carbide inserts, and have wanted to venture into high speed steel and different geometries. I held off because I thought I needed an expensive grinder. I will give this a go!
At school, I use HSS because they are cheap and quick to sharpen. Kids would shatter the carbide, and then try to machine their projects with the cutter holder. At home I use carbide except for unique cutters that I make from HSS.
Shoe everyone how to make a rounded nose bit. I make some just like you made yours here. But a round nose bit is also a useful shape. I taught as well :)
As a tradesman machinist, you already know that the clearance depends on the material you are cutting AND the type of tool holder. You can tell this is not used in a turret style tool holder.
Did you just make up your terms so students could make fun of them? I trained as a precision machinist (among other things, including teaching at MMI for 12 years) they are rake and clearance angles If your teaching you should at least try to get things right.
Good job- Very helpful !
posted this to beginners' thread on hobby machinist forum
I'm taking my watch, my ring and my "I'm alergic to children bracelet" HAHAHAHAHA that made me laugh quite a lot! xD
This seems pretty advanced; I hope reading a tape measure is a prerequisite. I'm 61 and would like to retire in the coming year but am reluctant to do so until the next new hire we take on can read a tape. Back in the 90s one guy I worked with could only read a tape in sixteenths. It stopped me in my track the first time he gave me a measurement of 12/16. Twelve sixteens would have been a great shop prank but he really couldn't read a tape in halves, quarters, or eighths; so I adapted. Currently my coworkers get a deer in the headlights look on their face when ask to check a length for say 33 'n 15/16.
I have a video on that: ua-cam.com/video/j1Nm27LTkIQ/v-deo.html Feel free to use my free curriculum in your training guide. (I have grade 12's sharpen lathe bits)
When I was teaching at a trade school, we had a few students who couldn't tell the time without a digital clock (couldn't use analog)
Luckily, not too many in the 11,500+ I taught as I had to teach measuring, feeler gauges, snap (T) gauges and ball gauges, vernier calipers and micrometer use (metric and Imperial) in the days before 'everyone' used $10.00 'Made in China' electronic calipers
I did manage to get 128ths of inch vernier removed from course as I had never used one in almost 30 years since I trained (although they are/were used a lot in woodworking I believe?)
I'm a bit older than you and switching from inch to metric is a little more challenging since I stopped teaching and using it 'everyday'
Hand them a set of standard dial micrometers with a Vernier scale instead of a digital readout, they are freak'n lost ! Even some coming out of community college with a degree in machining !
Wonderfull, cheers from Florida, Paul
What type of stone should be used?
I used whatever came on the grinder. A finer stone will give a better finish, however. in the school shop I stick with the more coarse stone and put up with a less-than-optimal finish in the interest of stone longevity with all the other grinding it gets used for.
@GregWellwood thank you! I have a lathe but have been using carbide inserts, and have wanted to venture into high speed steel and different geometries. I held off because I thought I needed an expensive grinder. I will give this a go!
At school, I use HSS because they are cheap and quick to sharpen. Kids would shatter the carbide, and then try to machine their projects with the cutter holder. At home I use carbide except for unique cutters that I make from HSS.
@GregWellwood thank for your insights!
Shoe everyone how to make a rounded nose bit. I make some just like you made yours here. But a round nose bit is also a useful shape. I taught as well :)
I always put my wrist watch FACE DOWN when ever I need to take it OFF !!!!
Many wee scratches hide that one BIG one that really bothers me (got it while wearing it).
I was a tradesman machinist and would never sharpen lathe tools like this. Too much clearance all over tool.
As a tradesman machinist, you already know that the clearance depends on the material you are cutting AND the type of tool holder. You can tell this is not used in a turret style tool holder.
Just eyeball it
Did you just make up your terms so students could make fun of them?
I trained as a precision machinist (among other things, including teaching at MMI for 12 years) they are rake and clearance angles
If your teaching you should at least try to get things right.
*you're
@@GregWellwood LMAO ! BUSTED ! I Love it when a know-it-all gets slam-dunked !