More machining work from Don's machine shop!

[Don Juan 679]

So latley I have had a lot of work to do at school and most of it has been machining and welding, I do not have many pictures of the welding but got some videos and pictures of the machining that I have been doing.

So here are some of the work I have been doing the past month, hope you enjoy.

 

I got a job of machining this brass piece, the outer diameter had a tolerance of +- 5 thousands of an inch.

 

I measured it using an electric caliper for a more accurate measurement as we did not have a micrometer for 5 inches

 

The outer diameter was within tolerance! I hit it quite good, it shows 5.000" and whit the caliper's accuracy at +- half a thousand of an inch I guess I hit 5.000+- 0.5 thousands of an inch.

 

The thickness of the brass plate had to be taken down as well, it was around 15mm thick and had a low tolerance of a size, I was to take it down to a thickness between 7 and 8mm so no tight tolerance there, I put it at 7.5

 

Picture while cutting

 

I also had to do the hole, It was to small at 77mm and the target size was 80mm. The outer diameter was to large for me to be able to the current chucks so i had to change them out for chucks that grabbed the piece in another way.

 

Here you can see the difference

 

 

Here you can see how it holds the brass piece compared to the other ones, Even whit those chucks it was a snug fit. I almost decided to to a bigger lathe...

 

For machining the hole you need an inverted cutting steel holder which holds the HM cutting tool towards yourself rather than away.

 

Here is an example.

 

This is how it looks when you will make the cut.

 

 

So now, the brass piece is done, the next piece I was working on I have less pictures of off. But it was a high precision piece I was going to make for an excavator or something, It involves an outer tolerance and an inner tolerance, the inner being +- 0.0025 mm and outer one being +- 0.005 mm

 

Here are some pictures of the lathe and the tools that I use for the precision work.

 

The 4 jaw chuck is the most precise one as you can use a dial to see how much the piece you are working on is slinging and you can then adjust each of the 4 jaws separably to adjust the work piece until it is centered completely. I will post a video of this piece centered.

 

 

 

These are the tools I used, cutting tool holder, multiple ones allow me to work more effectively as I do not have to 0 the tools whenever I change them. A dial for dialing the work piece, cutting oil for a better surface cut and looks. A hammer to hit anything that needs hitting. And the screen you see is the screen I use to know where my cutting tool is cutting, 0.48 means it is 0.48 mm away from the outer (In this case it is inner diameter since I am doing an inner cut) diameter, and the -140.15 means it is 140.15 mm "inside" the work piece as I am cutting to the left it will show a lower value the further to the left it is, 0 being on the edge.

 

I also have a few pictures of some boring of a rectangular shape in the lathe.

 

Obligatory before and after pictures.

 

in the lathe. To hold a rectangular shape you must use a 4 jaw chuck as a 3 jaw chuck can not get a grip of a piece with 4 sides.

 

This bore is 1 1/16 of an inch which translates to 26.98~27 mm to normal humans. my target size was 40 mm but I had to use an internal cutting tool for the rest since we do not have any larger bores.

 

After boring.

 

Heavy duty internal cutting tool, Due to the quality and size of the metal I had to use one of the larger tools we had.

 

To make sure you are getting correct cutting angles you have to center the tip of your cutting tool to the tip of the back dock center point, so that your tool is centered to the center of the machine. If it is above or below your measurements will be wrong and you might destroy the tool.

 

Chips, theese were flying all over and the blue color means a temperature of 300-500 Celsius ca 850 degrees Fahrenheit

 

Me and another guy in my class got a job from another school to make a big wheel which needed to be able to hold 2 persons. We used two trampolines and a lot of welding and other pipes to create this wheel, It has a diameter of 3.6 meters (ca 12 feet) and can hold 8 persons in a vertical load.

 

 

I guess that is it for now. I will put some videos below as I think you will find it interesting, just some boring and machining nothing special.

If you have any questions just shoot! You can send me pm if you want to as well. 100' post hype!

 

 

-DJD "Your local machinist"

 

 

[nothing_but_fail 484]

Turn the lathe on with the key in the chuck still

 

 

edit : pls upload welds because machining is boring 

[Don Juan 679]

Turn the lathe on with the key in the chuck still

 

 

edit : pls upload welds because machining is boring 

I will, on tuesday maybe. Dont have anything right now

[nothing_but_fail 484]

I will, on tuesday maybe. Dont have anything right now

 

ayyy nice, 

I'm doing horizontal short circuit on mig atm lol