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sand cores - the artfull-codger - 05-27-2013
[attachment=5389] A couple of cores for the last 2 fingerpost signs I'm making, the previous core was made with beach sand & John winters oil impregnated cereal binder dead easy mix 100/3 ad a bit of water ,mix then bake inthe oven@200*c this time I thought I'd make it with my own recipe.I've made them before when casting some brass gun stocks for a friend who made replica guns [30 odd yrs ago] it's 5ml boiled linseed oil,8 flat dessert spoons of sand,mixed up in a plaggy bag then 1/2 ounce of dextrin mixed with 20 ml water & add 1 flat teaspoon of bentonite[obtional] to give it a bit more green strength 'cos it's a bit fragile at this stage, then mold & bake in the oven @200*c for 11/2 -2 hrs till it darkens it's solid after that.
RE: sand cores - doubleboost - 05-27-2013
The linseed oil stinks
The wife was not very impressed with me
John
RE: sand cores - the artfull-codger - 05-27-2013
(05-27-2013, 03:19 PM)doubleboost Wrote: The linseed oil stinks
The wife was not very impressed with me
John
Aye your right there John,I waited till she went to bed!!
RE: sand cores - the artfull-codger - 05-28-2013
(05-27-2013, 03:46 PM)the artfull-codger Wrote:(05-27-2013, 03:19 PM)doubleboost Wrote: The linseed oil stinks
The wife was not very impressed with me
John
Aye your right there John,I waited till she went to bed!!
Yessss just cast the next fingerpost sign with the home blended core mix & it's come out good,pictures to follow,just 1 more pattern to finish & then cast it then we're finished apart from the painting & erecting in the garden & then all will be revealed!!
Graham.
RE: sand cores - DaveH - 06-01-2013
Right, I'm ready
DaveH
RE: sand cores - the artfull-codger - 06-03-2013
(06-01-2013, 11:37 AM)DaveH Wrote: Right, I'm ready
DaveH
Ha Ha, it's not that fantastic Dave,don't be disappointed, just a bit of poetic licence,incidently I've just finished the last casting & I'm fettling it up then ready to paint them all, I concreted the bottom of the pole in on sunday so we're good to go when I've finished painting.
Graham
RE: sand cores - the artfull-codger - 06-03-2013
[attachment=5427]
Hi, just finished the last pour for the fingerpost sign[so I thought!!] anyhow petrobond sand's still smoking, note the ''usefull'' cope weights, & yes I've poured without clamping/weighting & yes it all poured out of the joint but luckily I put my size 10s on it & managed to save the day,that was quite a few years ago .
Graham.
RE: sand cores - the artfull-codger - 06-03-2013
[attachment=5428]Yesss, just out of the mould & a success [this time],those of you who are observant will notice in the picture with the weights on will see there's only one sprue,well I got the other castings out with one but this last one's a lump longer & I knew I was pushing it but I thought it's s++t or bust" well it poured short!! so I put a riser in the other end & it cast o-k this time!! [can't win 'em all]
Graham.
RE: sand cores - the artfull-codger - 06-09-2013
Well,finally got the fingerpost sign assembled,painted & erected in the garden,I'll take pictures this week & all will be revealed!!
Graham. [don't get too excited boys it's not that exciting!!]
RE: sand cores - DaveH - 06-10-2013
The suspense is killing me
DaveH