Re: [CAD_CAM_EDM_DRO] Re: CAD experiment entry

Hi Tim and All:
     THANKS FOR THE IMPUT OF THE CAD EXPERIMENT
    Tim, why don't you use a set of custom soft jaws and machine the nuts out of rectangle bars?  This would eliminate the scrap from round to rectangle and half your milling with the live tools.  Just a little harder on the start of cutoff.
Note:  I recently did this to taper turn some octagon gun barrels and it works!!!
                                                                                      GOD'S BLESSINGS

                                                                                                  Bill Thomas                                                            
                              

On Wed, 15 Dec 2010 06:46:01 -0000, timgoldstein wrote

>  
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Peter Homann" <groups@...> wrote:
> >
> > Hi Brian,
> >
> > I think that this is why it is good to have a discussion here. There are
> > all sorts of CAD/CAM users here so hopefully we will get some really good
> > and honest reviews of various option.
> > I've only progressed to creating 2d dxf files and feeding them through
> > sheetcam to produce the separate processes.
> >
> > That's how I'd do the T-nuts. A separate layer for;
> > 1. milling the height
> > 2. drilling the hole
> > 3. milling the relief
> > 4. milling the outside rectangle
> >
> > Cheers,
> >
> > Peter
>
> When I moved from using a 2D approach to using 3D models and CAM that uses solid models it was a revolution in productivity.
>
> This would be my approach if I had to do a t-nut in the mill. Obviously this is machinging technique and not CAD.
>
> 1 - Start with a piece of stock that is at least 1/8" taller than the finished nut.
> 2 - Clamp in the vise on parallels with 1/8" being held.
> 3 - Face off about .010" to give a clean and true surface.
> 4 - Profile the entire part neck first and then the flange.
> 5 - Spot drill with a 90 deg spot to a depth that will also create the chamfer in the hole.
> 6 - Dill the hole.
> 7 - Tap the hole. (OK so I am using a Haas with rigid tapping)
> 8 - flip over and clamp on the neck with what will be the top surface of the flange on the top of the vise jaws.
> 9 - Face off the top hat left from OP10 until the face intersects the already profiled flange walls.
> 10 - Debur and tumble
>
> I reality we do it in the lathe with live tooling from a round bar. All the steps up through 8 are the same. Step 9 would be part off at the proper flange thickness and step 10 would be automatic bar pull and repeat. For the small sized Tuff nuts we make it is 75 - 140 nuts per 4 ft bar and 2 - 4 hours a bar. Far more efficient than using the mill and doing only a couple at a time.
>
> In the mill the top hat work holding approach is a valuable techinque. I was taught this by the first real machinist I hired. While never heard of it as a hobbyist, it is pretty much the standard approach in machine shops. A very useful technique regardless of what size machine you use.
>
> Tim Goldstein
> A2Z Corp
> A2Z CNC division
> 3955 S Mariposa St
> Englewood CO 80110
> 720 833-9300
> Toll Free 877 754-7465
>
> www.A2ZCorp.us/store
> USA made accessories for desktop mills & lathes.
> Specialized tools for the jewelry industry.
>
>

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