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View Full Version : Making a 7x10 QCTP?



sansbury
04-09-2009, 10:20 PM
Back when I got my 7x10 I bought one of the HF QCTP's and it has never worked well. It has a ton of overhang which is really not needed given the noodle-like qualities of the 7x10 to begin with.

I have been looking at the A2Z CNC model for a while and while it seems reasonably priced I've wondered how difficult it would be to make one myself.

http://www.peck-polymers.com/store/ProductDetail.asp?Cguid={7DB08D0F-FDEC-4D21-81A0-BE27C070DB94}&ProductID=18

I have the 7x10 obviously and also a CNC'd X2 mini-mill. I was wondering if anyone has built anything like this or could point towards some good plans for something similar.

GadgetBuilder
04-09-2009, 11:26 PM
John Stevenson posted a QCTP design:
http://www.metalwebnews.com/howto/toolpost/toolpost.html

And here's one that is simple to make and popular on the 7x machines:
http://www.homemetalshopclub.org/projects/toolpost/toolpost.html

Modifying the compound is common to reduce chatter and better fit a QCTP on 7x machines, see:
http://www.littlemachineshop.com/products/product_view.php?ProductID=1777&category=

There are lots of other tweaks to help reduce chatter on these machines.

John

websterz
04-10-2009, 12:50 AM
I built a QCTP from plans I got on mini-lathe.com While the post worked great and was easily built, I find the compound on the 7x lathes to be a source of flex that I can live without. I have no need for single-point threading, and the amount of parting off I do calls for the most rigid setup I can get. I pulled the QCTP and compound off and built a solid plinth to use in its' place. I have 3 toolholders that each do double duty. The first is a 3/8" boring bar holder/half-inch tool holder, the second is a 1/2 inch parting tool/5/16 inch tool holder, and the third is my diamond tangential tool holder for turning and facing. I can change tools plenty quick enough by rotating the block, and my tooling is always on perfect height because I did all the milling and drilling on the lathe. Nothing against a QCTP, I used them all the time before the big layoff. For me the 7x just isn't a rigid enough platform. YMMV

crancshafter
04-10-2009, 06:18 AM
sansbury
Have a look at: http://homepage3.nifty.com/amigos/qctp/qctp-e.htm
great plans for QCTP. I have made one of this for my 12x36 works great.

CS

loose nut
04-10-2009, 10:11 AM
HSM had a nice one, 1984 I think, if a bit unusual in design compared to the ones you can buy (I still have them if you want a copy, if it's allowed), that I built. Works real good and easy to make, can be scaled for size. It could be easily modified to take standard AXA (100) tool holders to save time and the trouble of having to build more and more holders. You can never have enough tool holders, it's a disease.

A mill is pretty much a requirement for building one of any design.

ClintonH
04-10-2009, 12:02 PM
I'll second these plans, this is the first thing I built on my mill/lathe when I bought em. Here's (http://www.flickr.com/photos/35549096@N07/3292498067/in/set-72157615669157135/) what I ended up with. If you want I also have these in PDF format with all dimensions etc, little more detail.



sansbury
Have a look at: http://homepage3.nifty.com/amigos/qctp/qctp-e.htm
great plans for QCTP. I have made one of this for my 12x36 works great.

CS

ww_kayak
04-10-2009, 12:43 PM
I'll second these plans...
I'll Third them. I haven't built it yet, but I have some drawings and renderings that I did based on his drawing (what can I say I like stuff in 3D). I've scaled mine based on the Aloris catalog (http://www.aloris.com/content/user_1/Aloris2006Catalog.pdf) for the CXA, but you are welcome to them. I've thrown a pdf with the drawings here: QCTP.pdf (http://sites.google.com/site/superjunkdrawer/Home/QCTP.pdf). If an admin or anybody else wants to host it somewhere else too that's fine. I hate reading old threads and the links don't work :(. Like I said I haven't built it yet so there may be some mistakes...

davidfe
04-10-2009, 04:59 PM
I'll Third them. I haven't built it yet, but I have some drawings and renderings that I did based on his drawing (what can I say I like stuff in 3D). I've scaled mine based on the Aloris catalog (http://www.aloris.com/content/user_1/Aloris2006Catalog.pdf) for the CXA, but you are welcome to them. I've thrown a pdf with the drawings here: QCTP.pdf (http://www.mediafire.com/file/wmon3gytvjz/QCTP.pdf). If an admin or anybody else wants to host it somewhere else too that's fine. I hate reading old threads and the links don't work :(. Like I said I haven't built it yet so there may be some mistakes...

W K,

Mediafire.com wherre you have the pdf file saved is a spam site / popup site as my firewall classifies it.

Do you have it any place else?

David

ww_kayak
04-10-2009, 07:47 PM
W K,

Mediafire.com wherre you have the pdf file saved is a spam site / popup site as my firewall classifies it.

Do you have it any place else?

David
Hmmm it seems to be a popular site... oh well, here it is on semi-permanent site. QCTP.pdf (http://sites.google.com/site/superjunkdrawer/Home/QCTP.pdf)
I'll edit the original post too, thanks

Tom

davidfe
04-11-2009, 09:54 AM
Hmmm it seems to be a popular site... oh well, here it is on semi-permanent site. QCTP.pdf (http://sites.google.com/site/superjunkdrawer/Home/QCTP.pdf)
I'll edit the original post too, thanks

Tom

Tom,

Thank you. Beautiful set of plans. Did you draw it? Excellent.

David

ww_kayak
04-11-2009, 02:25 PM
Tom,

Thank you. Beautiful set of plans. Did you draw it? Excellent.

David
I just created a 3D model, from the drawing on the nifty site mentioned above, and converted it to inches in the size I need for my Cincinnati. The drawings were then created from the 3D model. I'm no designer, so I'm sure the blueprints don't follow standard practices, but they work for me. The 3D renderings are just for fun :).