Diamond Stone

[Jason]

Sounds good. There isn't really a single 'best' angle. But 30 degrees give or take a few is good for most things.

 

[SteveF]

i will try another tomorrow and aim for 30%

 

[marcus]

RE the water/oil question I now use a squirt of WD40 on my DMTs which works very nicely.

 

[SteveF]

wd40 that will smell nice indoors

guess i will be sent outside

shame as the glass dining table works great for the superfine wet and dry

 

[J_SAMa]

I have left my dmt with water on for a few days, it goes rusty. But is cleaned off easily enough next time you use it, don't know if you left it on for ages it would do too much harm tbh. I use mine throughout the day several times, it's only when I don't use it over a weekend that it gets rusty. I have been using it for fifteen years like this, seems okay.


Sent from my iPad using Tapatalk HD

Diamond doesn't rust...
It's the residual bits of iron powder from the tools sharpened on the stone that rust.

 

[J_SAMa]

i used a 400\1000 diamond and finished with 1200 wet dry on glass kitchen table...dont tell the missus

i not sure what is best angle

this is by hand and no guide so had a go and got the protractor out

its like a new hobby so will go thru my chisel box until i get bored

hoping to get good enough to think about getting some decent chisels

35 deg for me, lasts so much longer than 30 deg angles (especially for harder steels). Some say that higher angles aren't good for cutting endgrain, true, but lower angles also tend to roll faster, rendering them less than ideal for any work. Also I have found that as long as the edge is sharp, the bevel angle doesn't really matter. Strop often enough and you'll be fine

 

[J_SAMa]

I have left my dmt with water on for a few days, it goes rusty. But is cleaned off easily enough next time you use it, don't know if you left it on for ages it would do too much harm tbh. I use mine throughout the day several times, it's only when I don't use it over a weekend that it gets rusty. I have been using it for fifteen years like this, seems okay.


Sent from my iPad using Tapatalk HD

Diamond doesn't rust...
It's the residual bits of steel powder from the tools sharpened on the stone that rust.

 

[SteveF]

more questions

my chisels are modern marples...the red and yellow ones...not that i am sure is important

i grabbed a 1" wide one and thought i would remove the marks from opening paint tins etc

i started on the base ...well thats as far as i have got

it is pitted right near the cutting edge
it also seems to have a dip in it along the length
as i am stoning it ( correct terminology unknown) it is scratching on outsides but not centre...along its length
eventually it starts to scratch all over..i hope thats a good thing
the pitting is still there...do i need to keep grinding away till its gone ?
should i polish back & forth or circular ?

HELP :?

can i save my chisels or bin em and buy new?

Steve

 

[Jason]

The pitting is a nuisance. You've got some choices about whether you put up with it (you'll have a knick in the cutting edge wherever there are pits) or grind the edge back (making the chisel shorter, not thinner, is sometimes quicker) to some clear metal. If you've got some clear metal close by, that might be your best bet. You can grind the edge back with a grinding wheel, or very coarse sandpaper stuck down on a flat surface.

If the pitting is really bad it might not be worth it. Keep in mind that a new good quality chisel is, what, £35. You can do your own math about how much time it's worth spending re-habbing an old chisel. It might be better used as a scraper or paint tin opener.

The hollow is your friend. The best case scenario is that you've a nice clean flat spot (maybe an inch or two) at the tip of the chisel and another at the rear, with a very slight hollow between. Chisel snobs may turn their noses up at Marples' unbreakable chisels (the side bevels are crude and not everyone likes the plastic handles), but all the ones I've seen the backs have been very well ground at the factory.

 

[SteveF]

lesson learnt i got rid of the hollow ...oops

the pit is about 1mm in from blade
i will grind it back

time is not a consideration as it is just a hobby....not a job

i am not a tool snob and would rather spend an hour fix than just bin it......it is good life skills i think

Steve

 

[Jason]

If 1mm back from the edge means that the pit isn't actually interfering with the edge yet, why grind it away? You could save yourself some bother and leave it be until it's an actual problem.