Spirit (of Glenans)
Well-Known Member
I know it's a little adrift of the OP's topic, but almost the first item on a Powerboat Course is that your painter should not be long enough to reach the prop.
Using a nail as an outboard shear pin?
- Thread starter Tim Good
- Start date
duncan99210
Well-Known Member
Agree with you in that but if the painter on a small dinghy is only slightly less than the length of the dinghy it won't be much use for mooring the thing.
jim.howes
Well-Known Member
Oh dear, I cringe when people like Thinwater suggest you grind brass on a bench grinder, It is both stupid and possibly suicidal. You must NEVER use non ferrous materials (eg brass, copper. aluminium etc) on a bench grinder for your own safety. Jim
rogerthebodger
Well-Known Member
Do please enlighten us to the damagers.
Graham376
Well-Known Member
A quick Google will tell you why - https://www.google.co.uk/search?biw...psy-ab&q=grinding+brass&btnG=&oq=&gs_l=&pbx=1
RichardS
N/A
Good grief ..... I cannot think of any metal or any plastic which I have not ground on my bench grinder over the last 40 years.
Except gold .... I can't remember grinding any gold.
Richard
rogerthebodger
Well-Known Member
Good grief ..... I cannot think of any metal or any plastic which I have not ground on my bench grinder over the last 40 years.
Except gold .... I can't remember grinding any gold.
Richard
I'm with you Richard, thats why I asked the question.
I must admit I don't grind much other than various steels as it easy to cut and file aluminium and brass any way.
I do grind tungsten carbide tools quite a lot and tungsten carbide is non ferrous as far as I remember.
I even sharpen my carpenters pencil on my bench grinder and carbon in no ferrous.
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DownWest
Well-Known Member
Non ferrous and ally are supposed to clog the wheel and cause it to disintergrate, possibly with injurous results. I was told this circa 1960? and heard it often since.
Recently, I find one can buy cutting discs for 'all materials' including ally. So they seem to have got round the problem of clogging.
Long time ago, friend used to cut up old ally castings with a disc. dipped it into a block of beeswax, then cut a bit of ally. Back to the wax and cut a bit more ally. He is still alive.
Recently, I find one can buy cutting discs for 'all materials' including ally. So they seem to have got round the problem of clogging.
Long time ago, friend used to cut up old ally castings with a disc. dipped it into a block of beeswax, then cut a bit of ally. Back to the wax and cut a bit more ally. He is still alive.
D
Deleted member 36384
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Nasty stuff that beeswax.
DownWest
Well-Known Member
Ho Ho,..
He was doing work experience for a sculptor, much of which involved cutting up old castings to re-cast into some new 'art'
He was doing work experience for a sculptor, much of which involved cutting up old castings to re-cast into some new 'art'
jim.howes
Well-Known Member
HI read the post 65 from graham376. Tungsten carbide should be ground with a green silicon carbide wheel not the normal grey types. DownWest is on the right track ,but when the wheel has been used on non ferrous materials it becomes LOADED(a technical term) and they do not just disintegrate they explode and with a wheel spinning at a possible 3000 + rpm the results are rather nasty. DownWest also mentions CUTTING discs which are a totally different story as they are fitted to portable grinding machines not bench grinders and yes they cut any material because they wear away quicker than they can clog. When I worked(now retired) as a fitter/turner chargehand the rule in the workshop was anyone caught using a bench grinder to grind non ferrous material they were liable to instant dismissal. And by the way mild steel has a carbon content. Jim
JumbleDuck
Well-Known Member
Why not just have a non-ferrous wheel on one end of the bench grinder?
It should all be as the carbide, though.
KellysEye
Well-Known Member
I would stick with a shear pin that is what they are made for a nail isn't.
AngusMcDoon
Well-Known Member
I'm going to make a new rabbit hutch when I get home for Flopsy. I've got lots of redundant shear pins from long dead outboards. Do you think I could use up the old shear pins to nail the hutch together?
Pirx
Well-Known Member
I'm going to make a new rabbit hutch when I get home for Flopsy. I've got lots of redundant shear pins from long dead outboards. Do you think I could use up the old shear pins to nail the hutch together?
Only if Flopsy is properly calibrated so that you know how much force he/she can exert ...............
JumbleDuck
Well-Known Member
I'm going to make a new rabbit hutch when I get home for Flopsy. I've got lots of redundant shear pins from long dead outboards. Do you think I could use up the old shear pins to nail the hutch together?
It will probably be about as successful as my experiment in fastening a clinker dinghy together with 13A fuses.
Heckler
Well-Known Member
A one square inch piece of steel as a sheer pin for a 3.5 Mercury? hohum!
penberth3
Well-Known Member
I'm going to make a new rabbit hutch when I get home for Flopsy. I've got lots of redundant shear pins from long dead outboards. Do you think I could use up the old shear pins to nail the hutch together?
Use them as dowels, not nails.
penberth3
Well-Known Member
You don't understand this stress and strain thing, do you? Nobody suggested a one inch square shear pin. Go back and read the post again, slowly.
rogerthebodger
Well-Known Member
Just need to read my post No 60.