dazz
Stainless
- Joined
- Aug 20, 2006
- Location
- New Zealand
Hi
I have an English Viceroy lathe (like a Boxford) but my question is probably applicable to anyone that wants to cut a spindle thread.
I want to make a morse taper spindle. It will have a male No.3 morse taper on one end and a spindle nose on the other. I will allow me to hold attachments like 4-jaw chucks in the tail stock.
This is not an original idea and I thought it would be easy to find info to make one. I have found the info I need to make the morse taper. I have been unable to find full specifications on the spindle thread form. I know it has a major diameter of 1.5". It has a 8TPI pitch and 60 degree angle. I have measured the diameter of the spindle on my lathe using the 3-wire method and then used a cad program to calculate the dimensions.
I don't know the correct radius at the thread peaks and valleys and I don't know how far away the thread is from the limits.
To maintain accuracy, I need to leave the work mounted in the lathe and just cut the thread to the correct size. I won't be able to trial fit the thread.
So what I'd like to know is the correct specifications for the following:
-the major diameter if the thread peaks were sharp and not rounded. This will be greater than 1.5". I will be able to work backwards to calculate the 3-wire diameter measurement I should be aiming for.
-the correct radius for the peaks and the troughs. I will use this info to help grind the tool to the right shape.
With this information, I will be able to cut a spindle thread that just works. Without the thread form specs, I will just have to make a close copy of the present spindle thread.
I have an English Viceroy lathe (like a Boxford) but my question is probably applicable to anyone that wants to cut a spindle thread.
I want to make a morse taper spindle. It will have a male No.3 morse taper on one end and a spindle nose on the other. I will allow me to hold attachments like 4-jaw chucks in the tail stock.
This is not an original idea and I thought it would be easy to find info to make one. I have found the info I need to make the morse taper. I have been unable to find full specifications on the spindle thread form. I know it has a major diameter of 1.5". It has a 8TPI pitch and 60 degree angle. I have measured the diameter of the spindle on my lathe using the 3-wire method and then used a cad program to calculate the dimensions.
I don't know the correct radius at the thread peaks and valleys and I don't know how far away the thread is from the limits.
To maintain accuracy, I need to leave the work mounted in the lathe and just cut the thread to the correct size. I won't be able to trial fit the thread.
So what I'd like to know is the correct specifications for the following:
-the major diameter if the thread peaks were sharp and not rounded. This will be greater than 1.5". I will be able to work backwards to calculate the 3-wire diameter measurement I should be aiming for.
-the correct radius for the peaks and the troughs. I will use this info to help grind the tool to the right shape.
With this information, I will be able to cut a spindle thread that just works. Without the thread form specs, I will just have to make a close copy of the present spindle thread.