Thanks: 1
Likes: 0
Needs Pictures: 0
Picture(s) thanks: 0
Results 1 to 6 of 6
-
17th April 2015, 01:32 PM #1SENIOR MEMBER
- Join Date
- Nov 2010
- Location
- Gippsland Victoria
- Posts
- 554
wheel sizes, wheel shapes, motor sizes for metal lathe tools
Hey,
Written from perspective of setting up to grind metal lathe tool bits.
Would I really notice a huge difference if I upgraded my 20 year old el cheapo 6" ryobi 1/3HP grinder for a 6" grinder with bigger stronger motor ?
How about 8" grinders - are they really worth it - for starters the wheels seem far more expensive.
I think the white wheels are great compared to the grey wheels I got with the grinder.
Do many people use those fancy recessed or the fancy flared cup grinders ? Seems to me that they would make life much easier for getting straight grinds on known angles for metal lathe toolbits but I get the impression that very few people use them.
I also get the impression that lots of people grind on the flat side of conventional wheels despite manufacturers warnings.
Saw this the other day ............. http://www.nortonindustrial.com//upl...ton%281%29.pdf
Off down the shops now to ask the same questions.
Bill
-
18th April 2015, 12:45 PM #2SENIOR MEMBER
- Join Date
- Jan 2004
- Location
- Bellingen
- Posts
- 551
Mate, I reckon just about any 6 or 8" would be fine for lathe unless your really hogging out big cutters. Even then it just depends on if your in a hurry.
But your allowed to want fancy tools! The diamond cup grinders look like the business!
-
18th April 2015, 01:15 PM #3SENIOR MEMBER
- Join Date
- Nov 2010
- Location
- Gippsland Victoria
- Posts
- 554
-
18th April 2015, 03:30 PM #4.
- Join Date
- Feb 2006
- Location
- Perth
- Posts
- 24,746
I've had 6, 8 and 10" grinders and all manner of wheels over the years - currently I have 5 grinders
Recently I modified an old 8" 3Phase grinder to be variable speed and I put a CBN and diamond wheels on it.
See https://www.woodworkforums.com/showthread.php?t=188429
The CSN wheels are expensive but a big step up for HSS tool bit formation and sharpening since it grinds fast and cool, not that it worries HSS but you can hang onto it longer.
The flat lapidary diamond wheels are cheap but should not be used on HSS but can be used to touch up carbide.
CBN are specifically designed for HSS and a bigger step up than from a grey to a white wheels
They work so well I am about to give away all my old grey and all bar one of my white wheels.
Ideally to get better control with a CBN wheel you need to use a grinder that can run at about half the usual speed
-
18th April 2015, 07:35 PM #5SENIOR MEMBER
- Join Date
- Nov 2010
- Location
- Gippsland Victoria
- Posts
- 554
Diamond on HSS
Thanks Bob I will check out CBN wheels - I could probably put one on my diy wood lathe to get it at the right speed.
This bloke ( http://www.mechanicalphilosopher.com/kbsharpening.pdf ) seems to have had success with tiny $5 diamond wheels on HSS - I am quite impressed. I was wondering about trying them, Why dont you like the diamond wheels for HSS ?
I did some experiments today with sandpaper on a faceplate and a simple jig, that surprised me - not as good as a white wheel but better than a grey wheel.
BillLast edited by steamingbill; 18th April 2015 at 07:51 PM. Reason: added $5 & changed to better weblink
-
18th April 2015, 09:30 PM #6.
- Join Date
- Feb 2006
- Location
- Perth
- Posts
- 24,746