Hi Keith - my machining mentor, Chip Todd, once worked for a company that made gas regulators. These regulators used a very small orifice sized depending on the type of gas and intended flow rate. So they were drilling thousands of small holes per day in brass regulator bodies. Chip's boss (Engineering manager) came by one day and said his team was running the drills at too low of an RPM. Chip took this as a challenge and hired a boy "off the street" to run an experiment. They ran small bits at various RPMs and recorded how many holes could be drilled in brass before the bit wore out. To Chip's surprise, RPM made a huge difference in drill bit lifetime. Huge. Speeds and feeds. Tool tip speed determines whether you make chips or heat. Speeds and feeds - hasn't changed for 100's of years - actually will never change. Great job for pointing this out Keith!
A good place to find equipment is actions of machine shops closing. I was lucky and came across a large companies lab was closing and it had a lot of low hour machines and tooling that went cheap due to the lack of bidders.
I use cemented carbide tools on my bench lathe. They perform better than insert carbide tools because they can be ground quickly to resharpen the cutting edge. This is important as was shown in the video where the lathe isn't able to maintain cutting speeds. This is death to carbide which is very brittle. Here in the U.S. a 6 inch grinding wheel for carbide is ~$20 and in home use will last for years... a lot cheaper than a couple of carbide inserts. The other trick the home machinist needs to know is how to make and use a high speed steel shearing tool. These are just the thing for removing the last 0.002" diameter on poor machining steels like 1018 low carbon steel and where a good finish is desired. Here's a video showing how: th-cam.com/video/Ta5F3WC-gPo/w-d-xo.html Cheers from NC/USA
A dead centre wont have the runout that the live centre has (all-be-it small) from the bearing AND the actual conical tip runout as it rotates... This is especially important when turning between centres... 😎👍
Hi Keith - my machining mentor, Chip Todd, once worked for a company that made gas regulators. These regulators used a very small orifice sized depending on the type of gas and intended flow rate. So they were drilling thousands of small holes per day in brass regulator bodies.
Chip's boss (Engineering manager) came by one day and said his team was running the drills at too low of an RPM. Chip took this as a challenge and hired a boy "off the street" to run an experiment. They ran small bits at various RPMs and recorded how many holes could be drilled in brass before the bit wore out.
To Chip's surprise, RPM made a huge difference in drill bit lifetime. Huge. Speeds and feeds. Tool tip speed determines whether you make chips or heat. Speeds and feeds - hasn't changed for 100's of years - actually will never change.
Great job for pointing this out Keith!
Nice to see the lathe working again.
Thank you Keith.
Yes, I was about ready to phone the samaritans }:-)))
Agree about soluble oil. Many moons ago one of the machinists where I worked with used milk and all kinds of things as lubricant.
Great video Keith. I always find I walk away learning something new after watching your videos. Great Job
Thanks for sharing 👍🇦🇺
A good place to find equipment is actions of machine shops closing. I was lucky and came across a large companies lab was closing and it had a lot of low hour machines and tooling that went cheap due to the lack of bidders.
A bigger diameter cable to your shed may help with your volt drop problem.
I use cemented carbide tools on my bench lathe. They perform better than insert carbide tools because they can be ground quickly to resharpen the cutting edge. This is important as was shown in the video where the lathe isn't able to maintain cutting speeds. This is death to carbide which is very brittle.
Here in the U.S. a 6 inch grinding wheel for carbide is ~$20 and in home use will last for years... a lot cheaper than a couple of carbide inserts.
The other trick the home machinist needs to know is how to make and use a high speed steel shearing tool. These are just the thing for removing the last 0.002" diameter on poor machining steels like 1018 low carbon steel and where a good finish is desired. Here's a video showing how:
th-cam.com/video/Ta5F3WC-gPo/w-d-xo.html
Cheers from NC/USA
A dead centre wont have the runout that the live centre has (all-be-it small) from the bearing AND the actual conical tip runout as it rotates...
This is especially important when turning between centres... 😎👍
I find that for what I do, the live centre is always superior - less friction, heat & wear in the centre hole . . .
Have you ever considered building a tinkerbell 0-4-2 tank?
No, I once build a "Sweet William" though . . .
I finally got that MSM pun at the end. I guess that's appropriate, considering what day it is.
🔧😊👍