MechMate CNC Router Forum

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-   Rails & Rollers (http://www.mechmate.com/forums/forumdisplay.php?f=6)
-   -   A record of burnt out grinders . . . . (http://www.mechmate.com/forums/showthread.php?t=1170)

Alan_c Sat 23 February 2008 11:19

. . . . the first grinder started emitting puffs of smoke (it was a cheap Ryobi I had on hand) so hauled out some cash, bought a Bosch grinder and modified my jig plates to accept this grinder. What a difference! more power, less vibration and almost lash free gear head. . . .

smreish Thu 08 May 2008 13:22

...and that extra 1.1amps makes a HUGE difference when grinding the profile. I burned up the 402 model in one rail....the 452 model is still going strong on my workbench.

dmoore Sun 11 May 2008 18:20

The Ryobi AG452 died in a hail of smoke. I may have been pushing it a bit hard but it was still a little under powered for the job. I replaced it with a Milwaukee 6148.

Kobus_Joubert Mon 12 May 2008 23:07

. . . . a brand new 850 watt Einhell grinder. At first I notice a lot more power than my old 500watt Bosch that I used on my Y-Rails. But after about 40 minutes...poof...smoke...no more grinder. Just shows, some things are tougher in life than others. The Bosch is about 10 years old, did a lot of hard work, but is still going.

kn6398 Tue 11 November 2008 22:26

. . . . I burned the Chicago cheap grinder and had to buy higher amper grinder. . .

Gerald D Sat 29 November 2008 09:29

A little graveyard of grinders assembled above. Did I miss anyone? :)

bradm Sat 29 November 2008 09:40

Technically, I didn't burn out my cheap Chicago grinder on the rails, although it did die later during paint prep. When I went from the Chicago up to the Milwaukee 6148, my working rate on the rails went up by about 3X.

vishnu Sat 29 November 2008 10:17

OOps i have burnt my cheap chinese grinder even before i started cutting. Planning to borrow and get my job done. For continious jobs say no to Chinese items poor quality. Hope how our friends in USA are dependant on China for everything. Let's not go there
Vishnu

YRD Sat 29 November 2008 10:54

I own a Chinese and an Makita.

I think the Chinese warms faster, so a smaller production process.

If you expect cool and respect the ability of equipment, no problem :)

Gerald D Sat 29 November 2008 11:11

This thread is to record the grinders burnt while building a MM. The thread is in the Rails & Rollers topic. The idea is for newbies to make wise choices when getting a grinder for doing the rails. It is NOT meant for a general discussion of the quality produced by a particular country.

Red_boards Fri 21 January 2011 18:39

My DeWalt was new when I started the build. After the rails its bearings are sounding really harsh (and it didn't fit exactly into the skate). I was careful to do a few passes and then let the grinder cool, and I think this saved its life. No magic blue smoke yet, but I feel it's on its last legs. Maybe a bearing change will renew it. There's a bit of grinding and cutting yet to be done (including the z-axis).

Robert M Sat 22 January 2011 05:04

Red, I know all to well what you're refering to, look at my story ;)

smreish Sat 22 January 2011 12:31

Red,
Went thru two grinders on mine....I was a little impatient on #5...took my time on the second two machines and have had no other burn outs.

Repack the grease in the grinder head. There are two little 90 degree crown gears in the bath of grease that seem to "blow up".....(it's not a pretty site).....and replace the brushes.

isladelobos Sun 06 February 2011 10:36

3 Attachment(s)
I have one old Dewalt DW819 and his Brushes has ben finish.

I live in one island and is sometimes hard to find parts.

In one car electrical garage i take old alternator brushes and refurbishe the grinder with this.

Attachment 11203

Attachment 11201

Attachment 11202

Now i can test with the long rails hard work.
This Dewalt fit perfect in the Scate.

tjskmm Tue 17 May 2011 11:53

I have the laser-cut skate parts from the kit and do not want to modify them. Other than the need for longer screws, which grinder models fit the kit without modification to the skate part or the grinder?

KenC Tue 17 May 2011 22:00

The grinder mounting screw is almost always wrong, you will still need to modify the hole position now matter what.

tjskmm Tue 17 May 2011 22:17

What make and model was the rail skate originally designed for? I have a couple of grinders that do not match the mounting holes/slots, and don't care to go out and buy more trying to find one that works. The laser cut parts from the kit do not leave too much room on the top holes to experiment with. The distance between the mounting plate and the grinding disk surface will vary from one manufacturer to another. I've read the original posts on the design process, and there is no definite answer there, either. SOMEBODY has to know.

Gerald D Wed 18 May 2011 00:49

http://www.mechmate.com/forums/showt...6&postcount=61

Later, the basic hole diameter was increased to suit more grinders. The forum didn't have a consensus on the definitive grinder.

smreish Wed 18 May 2011 04:58

The El cheapo version 4.5A min grinder from Harbor Freight fits, and most Ryobi's from Home depot. But you will have to get the longer metric hardware from the store with spacers to properly mate to the grinder to the skate to keep the disk coplanar.


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