Needs Pictures: 0
Results 1 to 15 of 19
Thread: Tipped tool grinder wheels
-
20th Jul 2017, 10:18 PM #1Member
- Join Date
- Apr 2011
- Location
- Sydney
- Posts
- 99
Tipped tool grinder wheels
G'day all
I was lucky enough to pickup a GMF 6" tipped tool grinder off gumtree for a measly sum of $140 today. I haven't had a chance to wire a plug on and check it out but I have inspected the wheels and they appear to be your standard peripheral grinding wheels.
I've browsed the Norton catalogue but can't seem to find any wheels that are suitable to be ground on the side (It looks like the thickest wheel that can be used is 25mm).
Surely there are others out there with a similiar type of grinder who has had to purchase wheels to suit?
Cheers
Jonathan
-
20th Jul 2017, 10:56 PM #2Most Valued Member
- Join Date
- Nov 2007
- Location
- melbourne australia
- Posts
- 3,228
Are you sure those wheels can't be used for grinding on their side?
Good by BTW.
-
21st Jul 2017, 12:17 AM #3Member
- Join Date
- Apr 2011
- Location
- Sydney
- Posts
- 99
Thanks
I'm really not sure, thus appearing to be the standard peripheral grinding wheel. I always thought side grinding wheels were recessed or dished?
-
21st Jul 2017, 01:00 AM #4Diamond Member
- Join Date
- Feb 2013
- Location
- Laidley, SE Qld
- Posts
- 1,038
I'm not a grinder expert, but I think that for sharpening carbide tips that grinder would have originally been fitted with diamond laps, it looks like its been downgraded to a standard bench grinder. Top buy.
-
21st Jul 2017, 05:52 AM #5
Hi Jonathan,
A green wheel would have been fitted and used for carbide tool tips. I have one for a grinder that I built some time back. 5" inch diameter by 1/4 inch thick, maximum speed 5K rpm. It will whip carbide off the tool like crazy if you are not careful. I must confess that I tend to use CBN wheels nowadays, since I built the drill grinder and discovered just how good CBN is at getting a razor sharp edge on a HSS tool bit.
PS. It is not a problem grinding on the side of the wheel, just keep your fingers away from it when using it !Best Regards:
Baron J.
-
21st Jul 2017, 09:23 AM #6Mechanical Butcher
- Join Date
- Oct 2004
- Location
- Southern Highlands NSW
- Posts
- 1,894
What is CBN ?
-
21st Jul 2017, 10:17 AM #7Member: Blue and white apron brigade
- Join Date
- Feb 2006
- Location
- Perth
- Posts
- 7,183
Cubic Boron Nitride.
I have a 180 grit CBN wheel, Haven't used the green wheel since I got the CBN. I attached a $10 diamond lapping wheel on the side for TC stuff.
Using Eccentric Engineering's tool bit holder to hold the bit I run it back and forth a couple of tines across the flat table in front of the wheel and it generates a retouched cutting edge in about 3 passes.
TP2.jpg
-
21st Jul 2017, 11:02 AM #8Most Valued Member
- Join Date
- Nov 2007
- Location
- melbourne australia
- Posts
- 3,228
And I copied Bob!
I have a side table the same as the OPs, but the guards (now removed) that came with my grinder don't lend themselves to mounting the table.
The CBN wheel is fantastic. It doesn't seem to heat up HSS as much as traditional wheels do and it doesn't fling abrasive particles all over the workshop. Note mine has a 40mm wide section on the side.
-
21st Jul 2017, 11:10 AM #9Philomath in training
- Join Date
- Oct 2011
- Location
- Norwood-ish, Adelaide
- Age
- 59
- Posts
- 6,542
Where are you guys getting your CBN wheels from? I would not mind one on my drill grinder.
Michael
-
21st Jul 2017, 11:25 AM #10Most Valued Member
- Join Date
- Nov 2007
- Location
- melbourne australia
- Posts
- 3,228
I got mine from Vicmarc for $225. It cost more than the grinder!
https://vicmarc.com/index.php?option...category_id=20
-
21st Jul 2017, 11:48 AM #11Pink 10EE owner
- Join Date
- Aug 2008
- Location
- near Rockhampton
- Posts
- 6,216
Gold, the colour of choice for the discerning person.
-
21st Jul 2017, 12:05 PM #12Member: Blue and white apron brigade
- Join Date
- Feb 2006
- Location
- Perth
- Posts
- 7,183
I posted this in the WWF back in June
I read somewhere that CBN is 44 times more conductive than conventional al oxide wheels at removing heat.
On looking up thermalconductivity I found a wide range of values - it's strongly temperature dependent, and alloy and physical form dependent
At room temperature;
Steel ranges from 16 W/m șC for SS to ~ 70 W/m șC for some steel alloys.
Single crystal Al2O3 is around 12 but Porous Al Oxide is only 2.3 W/m șC
CBN powder is 180 W/m șC while single crystals are 1300 W/m șC
Interestingly diamond is 2200 W/m șC
For some applications CBN on Al wheels seem to work and Al ranges from ~60 for MgAl alloy to about 250 for pure Al
-
21st Jul 2017, 04:55 PM #13Member
- Join Date
- Apr 2011
- Location
- Sydney
- Posts
- 99
Thanks for all the replies, however I think i haven't been clear enough with my question
And that is, what model wheels (part number, brand, mfg number) are people using and where are they getting them from?
I've got CBN wheels on my 8" A&A grinder and they work a treat. I can source 150mm CBN wheels, however they're 40mm wide meaning the tables would need to be hacked or removed - something i'm not prepared to do.
Surely somebody out there makes a 25mm wide CBN wheel with a side face that can be used to grind on?
-
21st Jul 2017, 07:24 PM #14Senior Member
- Join Date
- Nov 2010
- Location
- Frankston south
- Posts
- 102
Can't help with the wheels...........But great score on the grinder, been after one for ages.
-
21st Jul 2017, 09:43 PM #15
Hello Jon,
I've seen CBN wheels as narrow as 6 mm and as wide as yours, but in every case they are on aluminium hubs ! The CBN being just a few mm thick on the outside edge of the hub. The Diamond laps shown in the pictures are quite thin and are intended to be mounted against a backing plate. To do what I think you are wanting to do, the answer would be a Diamond lap against the side of an existing wheel.
My CBN wheels are all cone shaped bar one which is cup shaped. The active surface is quite narrow, from 5 mm to 10 mm and about 3 mm thick secured to the alloy hub.
HTH.Best Regards:
Baron J.
Similar Threads
-
WTB - Surface Grinder Wheels
By electrosteam in forum WANTED TO BUYReplies: 4Last Post: 24th Oct 2016, 05:53 PM -
Where to get decent quality wire buff wheels for 8" bench grinder in Adelaide
By nearnexus in forum METALWORK GENERALReplies: 31Last Post: 15th Aug 2013, 09:58 AM -
clean up bench grinder wheels
By old_picker in forum METALWORK GENERALReplies: 45Last Post: 7th Oct 2012, 12:43 PM -
Adapting cup wheels to a bench grinder
By Bryan in forum METALWORK GENERALReplies: 28Last Post: 25th Dec 2011, 06:22 PM -
Carbide tipped tool holder
By neksmerj in forum METALWORK GENERALReplies: 37Last Post: 24th Aug 2007, 03:45 PM