question

Bent · Post by **Bent** » Thu Sep 15, 2011 9:38 pm

Identical posting from Classifieds for max exposure:

Take a look at the pic of the blue fly press that Richard posted. I need the male and female screw part. As you can see the threads are very course. I believe the diameter should be at least 1" and the length could be a foot(or more)
Right now I am visualizing the screw off of a wine press for example? Dig in your spare parts stash (Eldon?) and see if there is anything you could come up with.

This is for building that fly press we've been discussing. I believe I could cobble together the body and base..if I only had the screw...
Thanks guys!

pastor bruce kiser · Post by **pastor bruce kiser** » Fri Sep 16, 2011 8:26 pm

how about the screw in a good quality c-clamp? just grind the body
of the clamp apart to free the screw and make the end so it
will thread into your press.just a thought! or maybe one could use
the actual clamp as part of the press assembly.just have to weld some kind of reinforcement on it.more than one right way to do some things! pastor bruce

Bent · Post by **Bent** » Fri Sep 16, 2011 11:11 pm

There we have a bright idea! If guy cound find a big enough C clamp... Thanks pastor

mac639 · Post by **mac639** » Sat Sep 17, 2011 5:51 am

This is an interesting topic. I'd never thought of trying to cut pieces this way. If I was going to build something like that I'd try first to use an old car sissors (can't spell worth a damn) jack....which I have. Another option would be a 3/4" bolt/nut...or they sell 3/4" threaded rod at the hardware store, and nuts to match. The problem I see with "screws" is the leverage required, which would depend on the pitch of the screw. My biggest challenge would be how to make the punch and die, can't imagine how I'd do that.

Bent · Post by **Bent** » Sat Sep 17, 2011 12:16 pm

Mac, I thought the same- that threads with such a course thread would require lots of armstrong. That's until I saw a pic of the fly press with the big weights on the ends of the long arm. Here is where you get your torque. Just start the screw and the weights will provide the needed power from the centrifugal force of those weights. (Burt, hope I am right here)
As for the punch and die - sure, a bit of work is involved here. Burt says to use tool steel to make the parts and then harden them, which is easy enough. Heat your parts til they are orange and then dunk them in oil. I did that with my changer axle and it worked great.

Allan · Post by **Allan** » Sun Sep 18, 2011 10:48 am

Just a quick thing that no one has mentioned up to now.
The thread for an application like this is not going to be used to tighten anything - it is used as a 'mover'. For that reason, it needs to be a 'square' thread so that it doesn't tighten up as it starts to apply force to the cutting tool.
A conventional 'triangular' thread shape would tighten as force is applied and you would then end up working against that also. A square thread transfers the maximum force directly to the cutting tool and, just as important, can be easily wound back up again for the next cut.
The purpose of the weighed lever ends on the press is to allow for quickly spinning the screw into/out of position to start the cut - the weights add very little to the action of making the cut. (that is not the whole story - depends what kind of die/punch combo yo are using)
Check this link if you are interested in going this route... http://www.archive.org/details/blankingdies00emerrich

Dave L · Post by **Dave L** » Thu Sep 22, 2011 8:52 pm

HI Bent,
I like this press idea. An idea for the screw you are looking for might be something like this.
http://veritastools.com/Products/Page.aspx?p=161
http://veritastools.com/Products/Page.aspx?p=133

Dave

Steel Guitar Builder

question

Screw, anybody? :-)

Re: question

Re: question

Re: question

Re: question

Re: question

Re: question