The Shop > Metal Stuff

Sand Cores

<< < (3/3)

doubleboost:
Hi
They are 6 mill hex
You can get 7 mill as well
John

PekkaNF:
Some clips seem to have 1/4" hex....standard bit driver socket ie. any bit screw driver woithout bit seems to fit perfect.

Pekka

Pete W.:
Hi there, John and Pekka,

Thank you both for your replies.

I asked because I occasionally have to take care of one of my wife's toys, the pond pump.  Using a flat-bladed screwdriver on the head of the hose clip while holding the weed-covered, slippery hose or fitting in the other hand is unpleasant, to say the least!  The screwdriver always seems intent on damaging that other hand!  Last time I did better with a 3 BA socket on my 1/4" drive socket set (bought from K.R.Whiston of New Mills many, many years ago!) and I wondered how consistent the screw head sizes are across the various hose-clip manufacturers.

I know that the Jubilee Clip people used to offer a dedicated driver but I haven't seen one listed recently.  (Before everyone rushes off and does a Google search, I acknowledge that I haven't done that myself yet but ought to.)

Thanks again and enjoy the Bank Holiday (UK readers).

Best regards,

Pete W.

vtsteam:
Did some baked cores today using this method, which is different than the one I used in the past (Gingery method). There are a couple points worth noting here:

1.) The slot in the tube should be at least 1/4 of the diameter wide to allow easy release. So a 1" dia tube needs a 1/4" slot.

I had a lot of problems extruding until I widened the slot. This is particularly important on the smaller diameter cores -- I was making cores today using "half inch" PVC water pipe (5/8" ID actual).

2.) You lose some diameter because of the slot and because of shrinkage -- finished cores were 9/16" O.D.

3.) Very important: your cores will both compress when extruding and shrink in length while baking. I made a batch of cores using a 5" length of pipe packed full -- but the finished cores were 4-1/2" long -- so all were a complete loss when I went to use them. Bummer!

So as a general rule, allow 10% or 1/2" -- whichever is more, in the length of the tube. You could allow a generous excess and plan to cut off the ends, but in my case, I needed a wire in the smaller diameter core to give it enough strength to hold together while extruding. And it would be nearly impossible to reduce the length of a core with wire in it. So you really do need to use a correct length tube.

-- Larger cores are MUCH easier to make than smaller diameters.

Navigation

[0] Message Index

[*] Previous page