Norman Patent Style Qctp

prasad

prasad

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Guys,
I know I can buy a commercial QCTP for my Grizzly G4000 lathe for around $150. However it would deprive me the pleasure of making my own QCTP using equipment that is available to me. I am not thinking of making a Wedge or Piston type. I am wondering if I can make a "Norman Patent" style QCTP for my G4000 Grizzly lathe. I have a mini-mill for milling slots in the tool holder. So my logic is, apart from saving some money, I would stand to gain from the experience earned in putting my machines into some use.

My questions:
1. Has anyone made it? If yes any drawings or sketches? (Or any advice)?
2. Is there any reason to avoid going along this road? I do not see any commercial version sold in the market. Basically, is there any inherent issue with Norman Patent design?

All your inputs would help me.
Thanks
Prasad
 
Here is a picture I downloaded from Internet. I think this is only a typical design and there may be many variations to it.

Thank you
Prasad

Disassembled.jpg
 
Interesting concept. I'm making a 4 tool unit that mounts directly on the saddle, instead of the compound. Should I need the compound, i can still remove my unit and put it (the compound) back on. The distance between the spindle center and the top of the saddle is 1.88 something, allowing me to rotate the tool holder and still hold 3/4 inch tooling. I'm working up drawings, will post when they're done.
 
T Bredehoft said:
Interesting concept. I'm making a 4 tool unit that mounts directly on the saddle, instead of the compound. Should I need the compound, i can still remove my unit and put it (the compound) back on. The distance between the spindle center and the top of the saddle is 1.88 something, allowing me to rotate the tool holder and still hold 3/4 inch tooling. I'm working up drawings, will post when they're done.
Click to expand...

Hi

This Norman Patent tool post works very much similar to a QCTP - just like AXA. The main benefit is the feature to adjust the tool height using a tiny screw and then the tool height is set. You can remove a tool holder and fit the next one without further need to adjust the tool height. Each tool bit will have a mating tool holder that is adjusted once initially and it will not need re-adjustment unless it is disturbed. I have been searching the web and just found a set of design drawings at this web site by a Ralph Peterson. http://www.toolsandmods.com/docs/ralph_patterson_qctp.pdf I think these were drawn for 7x12 lathe but can be adapted for use on any lathe.

I think it will be good to retain the compound because of additional benefits that one gets from the compound. Norman Patent design was created by a person by that name in 1925 as I find it. It does not appear to be any patent protected from all my Internet discoveries so far.

It appears to be something that one can do easily in a hobby workshop. Why is it not popular then?

Thanks
Prasad
 
Doggone, that's a good looking project. I may have to reconsider. No, I'll finish my 4 tool that sits on the saddle, but I'm gonna have to make one of these Pattersons, too.
 
I have two designs to choose from - Ralph Peterson and Paul Alciatore. Paul's design looks thoroughly professional and has a flat milled edge on the tool holder that goes against the flat surface on the sleeve. Ralph on the other hand makes it very simple. The tool holder has a slit that gets squeezed tight to grip the round sleeve. Ralph's version appears to be easier to make and I think I will go for this.

My plan is to make the sleeve out of mild steel and the tool holders with 6061-T6 aluminum. Since I will need many tool holders making them out of aluminum will be easier. Aluminum is easier to machine. Any comments, anybody?

The disppointing find appears to be the shipping cost to get the materials. I see an estimate of about $20 for UPS ground from Speedymetals when the raw materials will cost me around $25. That is 40% will go for shipping.

I also looked at McMaster-Carr who have a distribution center an hour away from me. Material cost will be about $27 but no shipping cost if I drive over to pick it up from their "will-call" window. I am leaning towards this.

Thank you
Prasad
 
Sounds like good choices on the design and where to get the materials. The best to you.
 
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