Grinding tool bits - how do you do it?

[wareagle]

I am trying to grind my own tool bits with a bench grinder, and am having fair results. Accuracy isn't there (obviously), and I am wondering if building an attachment or dedicated grinder would be in order.

So, how do you all do it?

 

[lugnut]

I was having a problem grinding my lathe tools also until I built one o Mr. Ishimura’s tool grinding rests. It allows you to keep the table level and by raising the height various amount above the center of the grinding wheel you can maintain the angle you want. His web site is http://homepage3.nifty.com/amigos/index-e.html
Angle to cutting wheel cart Measurements above the center to get the Angle of cut

Angle 6" 8”
5° 0.261 0.349
6° 0.314 0.418
7° 0.366 0.487
8° 0.418 0.557
9° 0.469 0.626
10° 0.521 0.695
11° 0.572 0.763
12 0.624 0.832
13° 0.675 0.900
14° 0.726 0.968
15° 0.776 1.035
16° 0.827 1.103
17° 0.877 1.169
The thing won't let me put space between the columns
Mel

 

[tattoomike68]

A grinder just for tools is best. One for HSS and tool shanks and a green wheel for carbide.

Dont let friends use them to sharpen pocket knifes and shorten bolts on the tool grinder, keep a $40 bench grinder for that job.

I grind everything hand held, that way I dont turn my tool steel blue and ruin it.

 

[rake60]

Grinding the perfect tool isn't a perfect science.
You can grind a perfect tool but if it's not on center in your tool post it
still won't cut properly. The main thing is clearence. The only area of the
tool in contact with the work piece should be the cutting edge.
Awww they explain it better at Sherline Tool Grinding Tips
It can be done freehand with perfect results. It is a developed skill, but
one that you'll use forever.

 

[lane]

Don`t worry too much about the angles just give the tool bits clearance. on the average 5-7 degrees from cutting edge.

 

[RollaJohn]

Angle 6" 8”
5° 0.261 0.349
6° 0.314 0.418
7° 0.366 0.487
8° 0.418 0.557
9° 0.469 0.626
10° 0.521 0.695
11° 0.572 0.763
12 0.624 0.832
13° 0.675 0.900
14° 0.726 0.968
15° 0.776 1.035
16° 0.827 1.103
17° 0.877 1.169
The thing won't let me put space between the columns
Mel

One way to outsmart the software and create a legible table:

Angle ___ 6" _____ 8”
5° ___ 0.261 __ 0.349
6° ___ 0.314 __ 0.418
7° ___ 0.366 __ 0.487
8° ___ 0.418 __ 0.557
9° ___ 0.469 __ 0.626
10° __ 0.521 __ 0.695
11° __ 0.572 __ 0.763
12° __ 0.624 __ 0.832
13° __ 0.675 __ 0.900
14° __ 0.726 __ 0.968
15° __ 0.776 __ 1.035
16° __ 0.827 __ 1.103
17° __ 0.877 __ 1.169

A lot of extra work for something that should be simple. The software only recognizes one space between letters no matter how many you type.

Lugnut, what is your secret to entering the degree character?
Or do I just have a cheap keyboard?

 

[lane]

Try this .hold down Alt type 0176 =° ,Alt type 0186=º , Alt type 0216=Ø
ALT 0188=¼ Alt 0189= ½ ALT 0190=¾