I have a need for a hardness tester, and was thinking of making the Dave
Lammas design as published in ME in 1989 (August/September IIRC).
Has anyone here made this design? any suggestions, improvements, traps
In article , David Littlewood
Seems no-one has any useful experience to put forward.
I went to Blackgates Engineering yesterday, and found that one of the
casting patterns has got broken, and that since they only sell about one
set a year they are not giving any priority to repair or replacement. I
bought the last (incomplete) set of castings. Blackgates are AFAIK the
If anyone has a set of castings they don't need, or knows of another
source of castings, please get in touch (david at dlittlewood dot co dot
In message , David Littlewood
As the result of two such examples of customer care, Blackgates is a
firm I now avoid (see note below). Have you looked at the possibility of
fabricating the part?
Note: Does anyone know an alternative source of "Curly spoke" slate
wagon wheel castings (5" gauge, 3 3/4" diameter)?
If you think Blackgates are bad, just wait until you have
reasonable and legitimate cause to complain to Reeves 2000 about casting
quality and a certain female gets on your case!!!
Chris Edwards (in deepest Dorset) "....there *must* be an easier way!"
In article , Mike Hopkins
To be fair, they have to be commercially minded about these things - if
they sell one a year, it cannot take priority over other things, and I
can't claim they failed in any duty to me.
Yes, I have looked at the missing casting, and it could be fabricated -
that is why I bought the rest. Would be a bit of a chore though.
I have a "Warman Penatrascope" that you can borrow if you want. It's a
dimaond pyramid device and will take samples up to about 3" thick. As
it's on my study shelf as an ornament, it's one of the few engineering
things not crated and palleted. (I had to go and buy a battery charger
this morning, as the four I have are inaccessably crated!!)
I've got an ancient Firth hardness tester, missing a few bits such as
the testing ball and in need of a good clean, which you could have for
nowt if you can collect it or maybe even speak to Charles, depending
upon where you are.
(I've got a much tidier version which I'm keeping).
In article , Nick Mueller
It uses the Vickers method, with a 30 or 120 kg effective pressure and a
138 degree tungsten carbide 4-square pyramidal cone. This is good enough
for any steel, obviously not for carbides or other exotic stuff (for
which you need a diamond). You have to grind the pyramid yourself, but
as I have a Clarkson that should be easy enough.
Let me know if you would like more details.
In article , Andrew Mawson
That's most kind, I'll take you up on that, at least it will keep me
going until I get around to making the Lammas one.
You should have said about the charger, I have one here you could have
Any update on the move date?
In article , John Stevenson
Thanks John. I have a couple of those exact ones, but I don't think the
diamond shape is precise enough; also not sure if the setting is up to
the pressure. I may give it a go when I've made the instrument, but for
what I need to do a tungsten carbide pyramid will be hard enough.
Don't get too excited, you haven't seen it yet
Probably better approached as a good basis for a tester, than a tester
which just needs TLC.
I'm near Warrington.
It's for Brinell though with smaller ball and therefore smaller
forces then the standard Brinell tester. The later version I have
(variable force) can also be used with a diamond, not sure whether
that applies to this one (fixed force).
In article , Tim Leech
I travel up to Lancashire most months (unfortunately just got back
yesterday) so I could come and inspect. Would it fit in the boot of a
(large) saloon car?
Could you please send me your un-munged e-mail address to david at
dlittlewood dot co dot uk?
David, I'm arround tomorrow (Sunday) if you want to come and collect -
give me a call. Move date not definate yet - contracts are signed but
not yet exchanged - it's looking like 3rd week in October, but that is
bang on when my Daughter is getting married !!!!