My first injection mold and the Rabit HY-4 injection molder

[gavztheouch]

http://www.ebay.co.uk/itm/1411621341...%3AMEBIDX%3AIT

Bought this 40mm long bar from ebay, hopefully I will be able to chuck it up in the lathe and still get enough material sticking out to make a blank for the injection molder.

[Robin Hewitt]

IIRC I have about 4 or 5 feet of 4 1/4" 7075 T6 somewhere in my workshop.

[gavztheouch]

Sounds tempting Robin but I don't think my myford will be able to work something that big.

[gavztheouch]

Anyone got any ideas as to what a custom made carbide or hss tool would cost to cut the profile for my injection mold "nozzle gate" as per drawing?

[mekanik]

Can you make one of these

D bit.doc

[Robin Hewitt]

I am still not understanding, isn't this shape ground into steel perfection for you as part of the sprue bushing?

[gavztheouch]

I am still not understanding, isn't this shape ground into steel perfection for you as part of the sprue bushing?

As far as I know you cannot buy sprue bushings for this machine, you have to machine them yourself into the fixed halve of the mold.

[gavztheouch]

Can you make one of these

D bit.doc

Would this be possible to make on a standard myford ml7-r?

Im guessing it would need to be quite high quailty steel? Hss?

[mekanik]

Hi Gav
Yes it's made from silver steel which is a high carbon steel available in metric & imperial sizes and is ground finish and readily available. The bar is in it's annealed state and you manufacture your required tool then heat it to cherry red and quench, then polish the tool and apply heat to the end of the shaft and you will see the polished surface change to a straw color as this works it's way to the cutting part of the tool quench in cold water and that's it tempered.

Looking @ your drawing that profile is situated in the sliding part of the jobby that the mould goes into,is that correct ?

[Tenaja]

Would this be possible to make on a standard myford ml7-r?

Im guessing it would need to be quite high quailty steel? Hss?

I've made molds for my Rabit 2/3 out of aluminum. Nothing magic there.