Cutters

I made a little cutters for cutting in half all kind of tablets. These are made of 3mm stainless steel sheet. Design is quite rough but I like them that way. They are meant to be in everyday use, so scratches are inevitable.

This is where I started, a sheet of metal and a freehand drawing.

001start

I welded two plates together with mig.

002halves_together

The drilling has started. I was going to make this with freehand.

004more_drilling

After some cutting.

007shaping#3

Separation.

008halves_separated

Things are getting in shape.

009rough_fitting#1

After that I milled slots to avoid misalignment. I milled only 1mm deep and bent the rest of halves. Since fitting halves to the milling machine was a bit difficult, I had to use a file also.

011milled_and_filed_washer

Here we are getting some rough shape.

012forming

I cut the blades to correct length and sharpened the other blade. From a drawing you can tell that I forgot to make that little curve that keep spring in position. But no worries, I got it in the other route.

016drawing_and_a_product

Since then I changed to a softer spring, made some guardian rails for it and put a new bolt for keeping halves together.

And polished them too.

018quite_ready

019quite_ready_other_side

And that’s it!

 

 

 

A New Toy

I have got my hands on a new toy. A dividing head.

dividing_head#01

But it lacks a tool for tightening objects in to the chuck. So we need to make one.

I took a 22mm diameter shaft and measured that square hole has a 10mm side. So I need to take 6mm off from each four side of  the shaft. Chuck has a wheel of 36 teeth and one can lock those teeth in position, one at the time. A quick calculation gives that when the first side is milled down 6mm, 18th teeth must be locked in and then milling can continue. After that 9th teeth locked and milled. And the last 18th teeth and milled. (Of course this can be done by 9 teeth at a time.)

Her we are in the middle of the process.

dividing_head#02

When all sides was milled, I bored a 13mm hole to the shaft. At first I used a center drill bit and a lubricant and then I gradually moved from 6mm to the big one.

hole_square_ready

All I have to do is to cut those 22mm and 13mm shafts in convenient length and make some adjustments that 13mm shaft don’t slide through the hole in 22mm shaft. And of course to do some grinding. Shafts are just some ordinary steel (st52 or something like that) so I am not expecting them to last too long, but time will tell that. On the other hand, I don’t believe that this dividing head (and its new tool) is going to get too much attention in its current location. Conveniently other chucks around the shop uses a different size of a square tool.

to_be_continued

Here is the Machine behind all of this..

setup

And no, I don’t own it, I just can borrow it and facilities around it.

Remember to use at least safety goggles (and Colin’s safety tie 😉 ) when using metal working machines!