It starts at 12mm and tapers to a point - doesn't really matter the thickness at the end but FYI it is currently 5mm. The larger part at the bottom of the taper (which fits inside the tube) is the same diameter as the tubes I use which is 1" ID or 25mm.
If the taper tool for a lathe is elusive then if all else fails I would be willing to have the tool turned to a stepped or straight length. It just needs to form a core up the length of the powder. It probably would need to be remade though in stainless as ally would bend much easier.
The taper isn't critical as in size - want to keep it as long as possible but willing to see some metal removed. However it should be a perfect straight taper - thats all I need.
If you look at the pic, the base part has an Allen key screw and that detaches the tapered part. That has a round which would fit into a lathe chuck. So it does come apart.
I've just measured the whole length of the part and it's 8" long. The taper is 14cm or 5.51 inches. The taper to point part is the problem as it should be perfectly straight. Any bends or wobbles in the taper damages the grain of the rocket and makes them go pop.
The spindle part fits in a tube and you use the solid rammers (that have a hole) to compact the powder into a solid grain. That then slows the burn and turns the powder into something that produces thrust rather than goes boom!
I thought that it might need a special tool for the taper - so if...
Excellent - I'll leave this message posted for today and see who can help. I'm happy to drop off the part this weekend. It would be really good to have this fixed. Flying rockets is great fun for the kids...
Hi Guys,
I have an aluminium set of tools which has a spindle. This has become a little bent. What I would like to ask is if someone is near to Southend on sea and is capable of turning this solid bit of metal to make it true again. It is a taper of about 8 inches long.
It can be removed from...
At the moment they are laser cut. Eventually we would be stamping out - however this option means we need a tool made up and that is very EXPENSIVE. Plenty of big manufacturers have expressed an interest already and had discussions with Karl. (He also already has a product on the shelves) As it...
You are welcome to copy them for yourself till the cows come home. Mind you when they hit the market for around 50p to £2 or so (not sure yet) Is it really worth you making them to save a couple of £££? BTW if you start to sell them(The copies), then I wouldn't like to be in your shoes :whistle...
Karl Says This:
Answers to some questions.
I have a UK patent pending, covering all what you can see, what I'm trying to do here is get feedback from guys who have knowledge in metalwork and experience in other aspects. I'm looking to find a design that would be the best to market first, I'm...
Karl asked me to put this reply:
Here's some proper pictures.
They do work in dot and dab walls, sometimes better than normal as the back bends towards the back of the board when pushed in, The front could contain snap off grooves that you can bend off if you didn't want to have too much...
Basically it is tried and tested. You can hang off these things, I have seen it done. Try the silly shop alternatives - I personally have used them all - in my own DIY attempts. They all break, buckle or pull through with the slightest bit of weight on them. Once this thing is in place or even...