Die grinder - what do I want/need?

[twr7cx]

I need a die grinder.

I need to rework/service my Ashcroft HD CV's as per the instructions in http://www.aulro.com/afvb/discovery-2/241954-ashcroft-hd-cvs-rebuild-rework-servicing.html

The pictures don't show very well which unit is being used. So any recommendations on what type and where to get?

Am I looking at a pneumatic one such as:
Blackridge Air Die Grinder Kit - 15 Piece < Blackridge Air Die Grinder Kit - 15 Piece - Supercheap Auto (http://www.supercheapauto.com.au/Product/Blackridge-Air-Die-Grinder-Kit-15-Piece/340371) >
or something like one of the Bunnings offerings < https://www.bunnings.com.au/search/products?q=die%20grinder&redirectFrom=Any >

Or am I looking at a rotary tool style, e.g.
Bunnings offerings < https://www.bunnings.com.au/our-range/tools/power-tools/rotary-tools > or
Rockwell ShopSeries Rotary Tool - 130 Watt < Rockwell ShopSeries Rotary Tool - 130 Watt - Supercheap Auto (http://www.supercheapauto.com.au/Product/Rockwell-ShopSeries-Rotary-Tool-130-Watt/344538) >

The instructions specify to use a "metal cutting tool" (later referred to as a "metal grinding tool") and "flapper type tool". I don't seem to see these anywhere for the pneumatic die grinders but they come in the kits for the rotary tools.

[Toxic_Avenger]

I've got a dremel which has had a lot of use for oddball jobs as well as car stuff, and is a useful gadget, but I've never rebuilt a CV.

Would a selection of files and emery paper do a good job for a fraction of the cost of tooling up for it?

[101 Ron]

The die grinder itself matters little so long as it has a 1/4 collet.
The instructions talk about a metal cutting tool, by which they mean a tungsten carbide cutter which is able to smoothly cut harden metal and is only usually available with a 1/4 inch shaft.
A cheapo die grinder will work so long as it spins fast enough
(15000 to 20000 rpm)
A reasonable tungsten cutter will cost 40 to 50 dollars.
One with a rounded head and about 1/2 to 3/4 inch diameter should work for what you need to do.

[Pedro_The_Swift]

only running shop air will you successfully grind metal,, you will need hearing as well as eye protection,,
flapper wheels for die grinders are mostly for polishing
flapper wheels for 5" grinders are very good (but a different design :) )

https://www.aulro.com/afvb/images/imported/2016/11/362.jpg
https://www.aulro.com/afvb/images/imported/2016/11/363.jpg

[steveG]

If you've already got a compressor get a pneumatic die grinder. Electric will do the same job but are generally much more bulky. Make sure it's 1/4" as there are some 6mm ones floating around and most tools are 1/4" (6.4mm).

Steve

[twr7cx]

The instructions talk about a metal cutting tool, by which they mean a tungsten carbide cutter which is able to smoothly cut harden metal and is only usually available with a 1/4 inch shaft.

The instructions do state 'metal cutting tool' on page 4, however, on page 5, this same tools is referred to a 'metal grinding tool'.

The pictures on page 4 which show the 'metal cutting/grinding tool' being used show a pink disk like tool. When I Google searched 'tungsten carbide cutter' the results were one of these:

https://www.aulro.com/afvb/images/imported/2016/11/361.jpg

Which is significantly different in style to that shown in the instructions. It seems to me that it's more of a grinding disc style tool that they are using - which lines up more with the job as it's to grind off some high spots rather than cut into it. Thoughts?

[Toxic_Avenger]

A rotary tool (Dremel?) with a grinding stone will do this with ease.
So will the stone in a drill if you don't want the additional cost.

[PLR]

G`day ,

as mentioned a die grinder is a die grinder it is the shape of the body that helps or hinders .


Die grinders use bits or burs in normal use ( or you can use stones ) and this is not what you need .

Google , die grinder grinder/sander wheel for the first task and die grinder flapper wheel for the second task .

The first task could probably be done with the flower type , don`t know what the correct name is . ( Flap Disc Wheel is what they`re called )

The bur is normally for removing more metal than needed in this case .

If you have used angle grinders the difference in finish is like using a grinding wheel and a paper disc ETC or a bastard file and fine sandpaper sort of thing .

Like paper these things are graded also .