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grinder cut off disks

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Dan in North Houston
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PostPosted: Sun Feb 10, 2019 6:43 am    Post subject: grinder cut off disks Reply to specific post Reply with quote

I bought some of the thin cut off disks that you use in a 4 1/2" hand held grinder, thinking they would come in handy. The first time I used then, they worked great.
Since that time, I've had no luck at all with them. They get pinched or get in a bind and shatter. No matter how careful I am to have a light touch, avoid any side loads, or avoid getting them pinched in the work, they end up breaking.
Yesterday I had some bolts to cut off, and I broke 4 of them before giving up and using some thicker grinding wheels. The best run I had was maybe 20 seconds, most of them shattered in about 5 seconds.
There must be a trick to using them, anyone have any advice? Maybe that is why you can buy them in packs of 10?
 
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Mike Groom
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PostPosted: Sun Feb 10, 2019 7:09 am    Post subject: Re: grinder cut off disks Reply to specific post Reply with quote

It's the quality of the discs,not all discs are created equal,I've had good luck with Dewalt that I buy at Farm and Fleet,I'm a little leary of the packets of 10 in the discount stores because I don't want flying objects in my shop.
 
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kcm.MN
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PostPosted: Sun Feb 10, 2019 7:21 am    Post subject: Re: grinder cut off disks Reply to specific post Reply with quote

I'll ONLY buy cutting discs that are made in USA or Germany.

I've been fortunate that what foreign-made discs I've bought have held up well. Have heard from too many folks that the Chinese-made products often fail due to lack of Quality Control and lack of using consistent quality materials.
 
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Bob
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PostPosted: Sun Feb 10, 2019 7:42 am    Post subject: Re: grinder cut off disks Reply to specific post Reply with quote

"There must be a trick to using them, anyone have any advice?"

By quality THIN discs, then keep a death grip on the grinder and keep it aligned with the cut so it doesn't catch and jerk and break the wheel.
 
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Oregon Tractor Jack
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PostPosted: Sun Feb 10, 2019 8:02 am    Post subject: Re: grinder cut off disks Reply to specific post Reply with quote

There is a big differences in cut off disks. I try to only use the US or German disks also. The cheap ones will shatter to easily. A higher speed grinder also helps. I use either a Metabo or a DeWalt high speed grinder for cut off work. Either way, hang on tight when those disks bind the grinder can take off. Nothing like launching a grinder to wake you up.

OTJ
 
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JD Seller
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PostPosted: Sun Feb 10, 2019 8:02 am    Post subject: Re: grinder cut off disks Reply to specific post Reply with quote

I use them all of the time. You have to buy good ones. I rarely have one break. You do have to think about how your cutting to not put too much side force on the disk.

I also have found the flat disk work better. The ones with the raised center look great for cutting flush but they are not near as durable.

The best bang for the buck that I have found is "Benchmark Abrasives Brand" I buy them on EBay and direct. The ones on EBay are 100 disks with shipping included for a price of $65.99. My cutting torch does not get used very often anymore. It is easier and faster to just grab a 4 inch grinder and cut the majority of stuff.

Benchmark wheels on EBay: https://www.ebay.com/itm/100-Pack-5-x-045-x7-8-Professional-Metal-Steel-Cutting-Disc-Cutoff-Wheel/280667005048?hash=item41590ea078:g:Xl0AAOSwgQ9Vt~IO:rk:3:pf:0
Benach mark wheels on eBay

 
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David G
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PostPosted: Sun Feb 10, 2019 8:20 am    Post subject: Re: grinder cut off disks Reply to specific post Reply with quote

Make sure they are being side stressed when you clamp them down.
 
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Russ from MN
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PostPosted: Sun Feb 10, 2019 8:29 am    Post subject: Re: grinder cut off disks Reply to specific post Reply with quote

I've never had a problem with the ones I have, but they're probably .062 thick, I have some .032, but I save them for special jobs, they are a lot more susceptible to breaking. Have yours gotten wet? That can be bad for some.
 
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Dan in North Houston
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PostPosted: Sun Feb 10, 2019 8:37 am    Post subject: Re: grinder cut off disks Reply to specific post Reply with quote

Follow-up info:
first, thanks to all who have posted advice. The disks I got were from Home Depot, Diablo brand. Maybe not the best but I figured would be better than Harbor Freight. I've tried all of the thicknesses they sell, with the same breakage results. They've never been wet or thrown around in a tool box.
The regular grinder disks have a raised center, and the washer on the grinders I have (Craftsman heavy duty) is dome shaped to fit the raised center. Since the cut off disks are flat, do I use that dome shaped washer? I've tried drawing them up tight against the washer, which puts a lot of strain on the disks by pulling them up in the dome, and doing them not-so-tight, but have had the same results both ways.
What works better? A light touch or heavy pressure?
thanks again.
 
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Russ from MN
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PostPosted: Sun Feb 10, 2019 9:06 am    Post subject: Re: grinder cut off disks Reply to specific post Reply with quote

I think on one of my grinders I turn the washer/nut around so the disc is pinched between 2 flat surfaces. If you distort the disc in any way when tightening it it will prematurely fail.
 
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Jim in N.M.
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PostPosted: Sun Feb 10, 2019 9:23 am    Post subject: Re: grinder cut off disks Reply to specific post Reply with quote

Speaking of cut off discs, I'm having a real time trying to find the discs for my 4.5 grinders WITH the 5/8 hole, it seems that all I find is with the 7/8 hole! Does anybody have any great wisdom on this ?? Jim in N.M.
 
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Determined
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PostPosted: Sun Feb 10, 2019 10:00 am    Post subject: Re: grinder cut off disks Reply to specific post Reply with quote

CVPost-jim in N.M. wrote:
(quoted from post at 12:23:46 02/10/19) Speaking of cut off discs, I'm having a real time trying to find the discs for my 4.5 grinders WITH the 5/8 hole, it seems that all I find is with the 7/8 hole! Does anybody have any great wisdom on this ?? Jim in N.M.


A nylon drain plug washer or an o-ring is often the ticket to centering a disk that has a hole larger than the shaft.

It really only needs to hold the disk centered until you tighten up the nut.
 
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kcm.MN
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PostPosted: Sun Feb 10, 2019 10:03 am    Post subject: Re: grinder cut off disks Reply to specific post Reply with quote

One other question Dan -- How much do you torque the nut onto your discs??

With cutting discs, I never use the wrench. Just snug it up by hand. Rotation into the workpiece will finish tightening it all it needs.

Started doing that, as one time I was torquing on a cutting disc and heard a sound like the disc cracking; threw that disc away unused. Never "torqued" one since. That was many years ago and "likely" a cheap disc, but can't remember. I don't use cutting discs a whole lot.
 
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JD Seller
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PostPosted: Sun Feb 10, 2019 10:09 am    Post subject: Re: grinder cut off disks Reply to specific post Reply with quote

You need to flip the nut over so your using the entire flat side of the nut to hold the disk against the backing nut. If you have been using the side with the flange that centers wider grinding disks that is your problem. Diablo disks are good enough quality.

So your disk should fit the backing nut shoulder. Then the flat side of the clamp nut will hold the disk secure while supporting it out form the center hub.
 
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Oliver 500 Wa
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PostPosted: Sun Feb 10, 2019 10:38 am    Post subject: Re: grinder cut off disks Reply to specific post Reply with quote

I've pretty much used nothing but the HF cheapies for the past 10 or so years. I don't recall one ever breaking and they last as long as any others I've tried. I mainly use them to cut out rusted floors and walls from wood chip trucks when overhauling those.

They usually do get a bad rap here, but that does not line up with my experience.

I use Hitachi and Metabo grinders with them. Both of those use machined drive spacers and mounting nuts. Maybe that's part of why they hold up. The grip is very even and solid.
 
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