Recent content by DavidBC

I have been machining for 62 years and have never owned any digital measuring devices for that very reason. I can still remember when a sales rep first showed us Mitutoyo measuring instuments.

https://silodrome.com/porsche-tractor/

I served my time at an Australian company that manufactured sintered carbide tip tools. All the brazed tip tools were finished with diamond wheels with a positive rake and all the sintered tips were left as they were after the sintering process. Considering that they require a small increase in...

You are correct it is an art. There are several methods. 1. After you drill the hole and are going to use the hook and scrape method you use 3 reamers to prepare the bore before starting. The 3 reamers are a roughing, a finishing and then a burnishing reamer. The blank with the deep hole is now...

They use aircraft frame grade tube.

You are correct I also have the 2 books and also the 2 in PDF format.

I posted a design of a D drill on this forum yesterday. If you have a look at the design you will see that it has a vee groove the full length and a small hole also the full length. The hollow tube that is attached to the D drill and also longer than the depth of the hole is also deformed to...

Find attached the actual design of a D bit for drilling a hole in a 30" long rifle blank for a .30 calibre projectile. Using the basics of the design you should be able to resize the dimensions to suit what you require. I hope this will be of some help to you. Regards David

Find attached the actual design of a D bit for drilling a hole in a 30" long rifle blank for a .30 calibre projectile. Using the basics of the design you should be able to resize the dimensions to suit what you require. I hope this will be of some help to you. Regards David

Further to my post if you look at a chart that shows BSF Screw Threads you will find the depth of a 26 TPI thread is .0246". Regards David

The thread is a very early English thread. I have attached a jpeg file with the info you are after. It was known as a bicycle thread but is now called British Standard Brass (55 deg). I have a 5/8" x 26 TPI tap that you are after but living in Australia I cannot help you but I hope the attached...

Some interesting facts on WD40 for those interested. DavidB

Hi Ted, thanks for the reply. The specs of myford gears are actually quite basic, Bore 5/8" Thickness 3/8" Keyway width 1/8" 20DP and 14 1/2 deg pressure angle. Gear ended up expensive when you add the additional costs of money exchange, packaging and handling and postage to the original price...

Hi BaronJ, Thanks for the links but I have managed to source a 21 tooth gear. Just have to be patient and wait for it to arrive. In the mean time I am shifting everything around as I have sold my geared head Servian/Brunswick lathe and my vertical mill. I am rearranging the positioning of my...