On a steep learning curve

[magicniner]

but our main area of effort for now is to get a good, reliable workflow from paper sketch to milled piece.

The ability to import drawings and images to scale into your CAD would be handy, when I need to replicate a complex part I photograph it against a 1mm graph paper background, crop and size the image correctly in photoshop then import that image into CAM. In CAM I can then use the art module to create edge outlines, draw over/around the required areas or a combination of the two.

- Nick

[Laurie]

Interestingly I'm now increasingly moving away from pencil sketches. I do still take photos of knives for "inspiration", but then as long as I have one dimension (such as length) Inventor will scale my trace of the photo.

The reason I've stopped pencil sketches is because they've sort of become redundant: I can now do first draft designs just as well in Inventor, and I suppose the interesting thing about the workflow is that we need to then prototype possibly through several iterations, as it's about feel & heft more than paper dimensions - with the exception of e.g. a bolster, we have no 'tolerances' as such.

We've tried various materials other than steel for this, but since they weight less or have other properties too different from steel you can't really get a feel for it. The other advantage of using a low-cost stainless steel for prototyping is that then all the other processes (mainly heat-treatment and finishing) can also be run through.

However I'm thinking of trying to make some friction-held folding knives as a learning exercise. I have got some excellent templates in a couple of books and it had occurred to me how to get those slightly complicated shapes in accurately - scanning them in with a tracing paper grid overlay solves a lot of problems!

[Billythefish]

Hi Laurie,
haas as a first milling machine! Wow... Lucky you. Very dangerous :-)

In my experience (a bit) pencil sketches are of the utmost importance. Pencil sketch then cad. You need to have a firm goal before you start with the cad or design intentions will change not according to your design intentions...

Generally stainless is not heat treatable. Do you know the difference between austenitic and martensitic?

Consider water jetting or laser cutting or plasma cutting your blanks. Anything but milling. Why? Give it a go and report back.

Designing and machining is incrdible fun if you like this sort of thing. It is also a journey of success and failure.

Never give up and good luck!

cheers,
Billy

[Laurie]

Hi Billy,

All of our knives have started as pencil sketches, but the key thing is to get a prototype made and then have a feel and a think and then go back and fiddle with the CAD drawing, rinse and repeat. The other advantage of sketching in CAD is that you can get pretty good 3D modelling showing you how the knife will look - whereas any attempts at isometric or perspective drawing by hand (in my case at least) quickly turns in to a mess!

We use austenitic steel for our bolsters and other non-hardening parts. We're currently trialling Niolox and 14c28n for knife steels - so far all's going well with an inert gas/ electric furnace.

Because of the issue of fixing, we are trialling a magnetic fixing plate. This - so far - is certainly giving us enough grip and the accumulating of shwarf doesn't seem too bad, but we're still early days.

We both really, really enjoy what we do - the hard work at the moment is when we have to tie systems together as we've learned our most recent skills in a sort of 'silo' system, and so making sure that Inventor and the mill are completely synced is proving to be a slow, cautious process!

L

[Billythefish]

Hi Laurie,

Sounds like fun!

I would be interested to hear details of your heat treat setup. What oven are you using?

cheers!
BF

[JAZZCNC]

I would be interested to hear details of your heat treat setup. What oven are you using?

Stuff the Super charged Oven this is CNC forum we want to Know about the Haas.!!

[Billythefish]

Lol... Haas is seriously overated. You have to pay through the nose for absolutely everything.

Heat treatment is very important. No point wasting all that precious cnc time if you end up with a product that looks nice but doesnt perform :-)

cheers.

[magicniner]

I don't know, I'm partial to a little Furnace Porn now and again, heat treat, forge or casting ;-)

[Laurie]

The Haas is being fed by a 3-phase convertor in a room at the end of an old calving barn with a shetland pony as a neighbour. I think it is probably pining for a nice smart, factory ...

[Rob]

Hi Laurie, I'm also new to cnc and it seems you are much further ahead than me. There was a time not long ago I really wanted to make knives and specifically kitchen knives as I have worked as a cook among other things. I studied a lot about knife making, thought up some designs etc...and really got into the idea of getting a small induction forge to use instead of the stock removal method, but in the end decided it was beyond my resources. Maybe someday I will get a chance to make a knife :)

Just wanted to say all the best with the venture and please post or PM me your website when available so I can see your progress and knives. My new venture is completely different to knives but it's always very interesting to see how people conduct business and start-ups in particular.

Cheers
Rob :)