LumberJocks

Trouble with new diamond plates

  • Advertise with us

« back to Hand Tools forum

Forum topic by jklingel posted 01-10-2018 02:16 AM 1433 views 0 times favorited 10 replies Add to Favorites Watch
View jklingel's profile

jklingel

99 posts in 1356 days


01-10-2018 02:16 AM

I have four fairly new diamond sharpening plates (3” x 8”) and they just tore up the sole of my planes. What is happening is (1) the ends of the plates seem high or extra rough, but not consistently. I started with a 300 grit and my 5 1/4 Stanley plane and all was well for a few seconds. Then, a nasty grind was heard and I had deep gouges in the sole of the plane. Each end of the plate did this. I tried to take out the gouges with the 600 grit plate; same thing. I put 1/4 sheets of sandpaper on the plates and fixed the sole of the 5 1/4. This was with a set of 3 cheaper plates ($110 for 3). I then tried to polish the Stanley with a 4000 grit plate from one of the big companies ($100/plate) and the same thing happened, so I fixed it with sandpaper. Next, I took my little low angle block plane and ran it on all the cheaper plates, avoiding the ends. All was well up through 1200 grit. (2) When I got to the spendy 4000 grit plate, it periodically seemed to lose a diamond or two in one spot and scratched the sole pretty badly. I fixed that with the cheaper 1200 grip plate. My questions are: Is this typical until the plates get used a bit? If not normal, how do I fix the plates? Grind the ends off a bit? (I tried that a bit; no-go.) Should I forget using the plates on planes and use sandpaper atop the plates? Then too, at what grit should one quit on the sole of a plane? 1200 seemed awfully flat and polished. Thanks for any feedback. john


10 replies so far

View GAwoodworker's profile

GAwoodworker

37 posts in 967 days


#1 posted 01-10-2018 04:00 AM

I have run into the exact same problem with a new DMT Extra Fine that I bought. After a few uses, it seems as if diamonds came dislodged and scratched across the surface of the plate and re-embedded themselves. The result is a sharpening plate that has big scratches in the surface that gouge into what ever I am sharpening. It damages the edge of an iron when I am sharpening. I just stop at the Fine plate now and will probably get some shapton stones in the future. The other day, I used a friend’s diamond plates that he has had for 15+ years and got a massively different outcome when comparing them to mine. My new Fine plate was dramatically rougher than his Coarse plate, and he said he’s barely used it in 10+ years. We were both dumb founded. Even if he did use it a lot, massive wear on his plate still couldn’t amount to the differences we were seeing. I think the recent production in the past couple years has dramatically cheapened and quality control has gone down. I’ll be watching to see what other people say!
PS – I always flatten soles on sandpaper and a flat surface. Haven’t taken them to my plates yet. Only irons touch my pates.

View jklingel's profile

jklingel

99 posts in 1356 days


#2 posted 01-10-2018 06:23 AM

GA: That is discouraging, but thanks for letting me know. I am going to contact DMT, fwiw. I don’t know who made the cheaper 3 plates; I’ll have to look in some catalogs and see from whom I bought them. Cheers. j

View Andre's profile

Andre

2204 posts in 2005 days


#3 posted 01-10-2018 06:40 AM

I would never use any type of stone on the sole of a plane, 180 -220 grit sandpaper on flat surface, I use the self adhesive stuff for auto body work, stick it on the top of the jointer.

-- Lifting one end of the plank.

View jklingel's profile

jklingel

99 posts in 1356 days


#4 posted 01-10-2018 07:01 AM

from my first experience, i think i will avoid diamond plates in the future. if 220 grit is enough, then that is what i will do next time (maybe 320. super smooth looks so good….) i guess i got a bit carried away going to 4000 grit…..but, it looked so nice…. until a diamond or two got loose and scratched it! dang….

View nwbusa's profile

nwbusa

1021 posts in 2485 days


#5 posted 01-10-2018 10:14 AM

Have used my five DMT DiaSharp stones for several years with no problems. YMMV, I guess.

-- John, BC, Canada

View Carloz's profile

Carloz

1147 posts in 790 days


#6 posted 01-10-2018 12:19 PM

Yes, you should use diamond plates for a few hours on some cheaper tools or just a piece of steel.Out of 4 DMT plates I have one came pregrinded , probably it was the highest grit, do not remember. I used the rest to hone the iron of some cheap stanley plane and some old chisels before switching to the new planes.

View bbasiaga's profile

bbasiaga

1240 posts in 2194 days


#7 posted 01-10-2018 02:05 PM

I am not super happy with my diamond plates. I have a DMT coarse, and fine. I did not have the same issues you are having, but after restoring a few plane blades the coarse is almost worn out. It feels very smooth now and cuts slower than it did when I got it. I tried cleaning it etc but no help. I probably should have used sandpaper for those tasks in hindsight, but still I feel it should last longer. The fine stone is still good. No real issues with it I guess, other than it is probably a little more coarse than you really need for a first Sharpening step.

I will probably go to splash and go water stones at some point.

Brian

-- Part of engineering is to know when to put your calculator down and pick up your tools.

View JayT's profile

JayT

5960 posts in 2410 days


#8 posted 01-10-2018 05:09 PM

Diamond plates do have a break-in period where they cut more aggressively than the grit until some of the diamonds fracture and settle in. I’ve been using EZE-Lap plates for several years now and am very happy with them. Took sharpening half a dozen plane irons or so before they broke in and then have performed admirably since.

When doing plane restorations, however, I use sandpaper rolls on granite. More for the length than to save the sharpening plates. I usually stop at 220 for users. Any more than that is just extra effort for no performance gain. If you want to use higher grits to get a mirror finish because that’s the look you want, have at it, just don’t expect the plane to work any better.

-- In matters of style, swim with the current; in matters of principle, stand like a rock. Thomas Jefferson

View jklingel's profile

jklingel

99 posts in 1356 days


#9 posted 01-10-2018 05:51 PM

ok, thanks all for sharing your experiences. j

View jklingel's profile

jklingel

99 posts in 1356 days


#10 posted 01-12-2018 05:29 AM

just a fwiw. i took the diamond plates out today and ran the backside of some of the plates over the ends (diamond side up) of each plate. i found that the problem areas were really very small, and primarily right in the corners. as i ground the backside of a plate against the diamonds of another plate, i could see wear on the diamond face in areas that were mostly about 1/16” long and maybe 1/32” wide. one bad spot was about 1/32×1/32; a very nasty corner. possibly, areas the manufacturer never intended or expected anyone to use. i got very little gouging anywhere else, until i lifted the being-beat-up plate to “bevel” the diamond face, as i wanted to make sure the bad spots were removed completely. i did not run a plane over any plates to check. i think i learned my lesson on that deal. anyway, the plates appear to be very usable for what i gather is their intended purpose; sharpening chisels and blades…. and very large fishing hooks. seriously; if you don’t have a file/stone/diamond file in your tackle box, you better get one. those hooks need to dig into your fingernail nicely to be usable. but, i digress…..

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com