Does anyone know of a company that rebuilds (re-true/re-square) small rotary tables?

We have a Sankyo RT100 (A/C axes) that has been crashed and is A is no longer square to C.  We have shipped one over the pond before but the price was almost as much as a new rotary... any suggestions?

Thanks,

Jon

On our Mazak VCUs, it will do the same if the back feed is over 200ipm.  Has to do with the smoothing parameters.

We can take the exact same code and run it on a Mazak Compact or a Robodrill and it wont happen.

On ‎3‎/‎6‎/‎2018 at 8:24 AM, Ray D said:

If anyone cares, I created a similar program to find the -Y- and -Z- centerline based on 3 points. 

Basically, store the following variables then run the below code. It will set your 19700's. 

#750= 1st Y position

#751= 1st Z position

#752= 2nd Y position

#753= 2nd Z position

#754= 3rd Y position

#755= 3rd Z position

 

 

(MATH TO CALCULATE CL OF Y IS WITH 3 POINTS) 
#101=[[#750*#750]+[#751*#751]]*[#753-#755] 
#102=[[#752*#752]+[#753*#753]]*[#755-#751] 
#103=[[#754*#754]+[#755*#755]]*[#751-#753] 
#104=#101+#102+#103
#105=#750*[#753-#755]
#106=#751*[#752-#754]
#107=#752*#755 
#108=#754*#753 
#109=2*[#105-#106+#107-#108] 
#763=#104/#109( CALCULATE Y CENTERLINE)
#763=#763*100000 

(MATH TO CALCULATE CL OF Z IS WITH 3 POINTS) 
#101=[[#750*#750]+[#751*#751]]*[#754-#752] 
#102=[[#752*#752]+[#753*#753]]*[#750-#754] 
#103=[[#754*#754]+[#755*#755]]*[#752-#750] 
#104=#101+#102+#103
#105=#750*[#753-#755]
#106=#751*[#752-#754]
#107=#752*#755 
#108=#754*#753 
#109=2*[#105-#106+#107-#108] 
#764=#104/#109( CALCULATE Z CENTERLINE)
#764=#764*100000 
 
M00( PRESS START AGAIN TO UPDATE 19700 ETC)
( PRESS START AGAIN TO UPDATE 19700 ETC) 
(UPDATE 19700) 
G10G90L52
N19701R#763
G11
G10G90L52
N19702R#764
G11

 

So what three points are you taking? 

Ive tried to get Methods to help us setup these parameters on a robodrill with basically no help at all.

I do this fairly regularly... I'd try to slow the sfm to around 100-150 and .0001-.0002" per flute feed. 

22 minutes ago, mkd said:

define backside

 

And just to beat C^millman : Morph between two curves :-)

and either to or from a control point for axis control

Yep. Good path even if you lock it to 3 axis. Good collision control and lead in/out as well

I ended up using morph.  Thanks Ron, that got me almost exactly what I was looking for.

Here's what I came up with:

https://www.dropbox.com/s/ctf4ryhz8bvqi0h/MORPH.ZIP?dl=0

Let me know what you think.

I actually started out using a 1/8" lollipop but I kept breaking them.  I swapped to a 1/16 Mitsubishi ball nose and it seems to be more rigid but I cant quite get it how I like it.

I think I see what you a saying about the .005" square as the "morph to" chain, but I cannot think of a good shape to use as a "morph from" chain...if that makes any sense.

I will poke around with the roughing page, never thought of that!  There are so many new parameters and lingo when you go beyond a simple 5 axis curve, just gotta figure them out one at a time!
 

Ok here is something closer to what i was talking about.  I was too worried about stripping the model down.

Notice it takes a large stepdown after about 20 passes... any way to smooth that out? 

Ron,  not sure what you mean by driving through a point for morph between two curves.  You mean using "to point" for tool axis control?

Would morph be able to handle all of the inside undercut surfaces in one toolpath?

Thanks,

Jon

MORPH.ZIP

34 minutes ago, C^Millman said:

Don't use the whole chain for your tool axis control. I would draw a line from the center of the 2 long lines. Only use one of the lines and I think you will like the results. Also put the line at a place of line of sight for the shape. Sometimes I will take an edge curve and offset it in and then move above to be the line of sight chain when doing something like you are doing.

If I were going to use Morph between 2 curves I would probably drive it through a center point, but it would do a better job on this show than what you have. I would also make a surface to go over the void or use model prep to make it more uniform of a surface it will help you get better motion there. Who care if you cut some air if you get a nice looking part.

You have collision control why aren't you using it?

I had to strip the file down, so I just threw some parameter together real quick.

Thanks Ron, I will give this a shot first thing in the morning!

This is the best I can do for now, I cannot share the actual file.  Its on a Mazak VCN Compact with a small Sankyo rotary table.

Let me know what other information you need.

MORPH.ZIP

Yea, ill have to strip it down a little though.

In the attached file, I am trying to cut the green surfaces using a single multiaxis toolpath.  Parallel and morph get me close, but the stepover is odd...

Anyone care to show me a morph strategy to get some smooth motion?  or even better, I single toolpath to finish the whole inside.  That would be sweet!

Thanks,

Jon

morph.X_T

You may need to turn off gouge check.

Try decreasing your gap settings.

Did you ever get the sample code for the variaxis? I've been wanting to try this on our VCU.

Depends. Holders I'll use a STEP file. Cutting tools I'll use a DXF or a drawn profile more often than not.

How do you use step files for holders?

Anyone have experience with an Integrex I-150? It's got a 2nd op vise/gripper rather than a sub spindle so the price should be quite a bit less than a full blown Integrex.

You should never touch the material and move z. Z height is set in mastercam.

A good way to set G54 z is go to B90. A0. And face the stock at say z.250"

Then rotated a180 and cut to z.250" again

Now mic the tab you just milled. Should be .500"

Now offset g54 z 1/2 of the difference of .500" and your part thickness

I've been wondering about the lil 300a. We've got a vcu400a and some vcn compacts. Looks like the 300a is pretty much a small vcu with the same rotary as a compact.

Id love to try one but the higher ups are about burned on Mazak now. Our service out here is not the greatest...

Haas is actually a decent machine. I've just recently gotten a chance to run them. I've always ran Mazak but for what I run on them, the Haas is just as capable. Haas service is top notch compared to Mazak.

Have not looked at tormach? Any specific model you recommend?

How do you like the tr160y trunnions? I've been eyeing that setup to put on a VF machine.

A little off topic but has anyone used the new small trunnions Haas just came out with?

Also, who else makes sweet mill/turns like that Bumotec 191?

All I really know of is Willemin and Chiron

No grinding needed. Just cutting metals and plastics.

I forgot to mention, 5 axis is definitely a must.

Would be for medical instruments and implants.

Thanks for the input guys! Just wanting to see what else is out there. It's so easy to get stuck using what you know.

Whoa those bumotec machines are sweet! Any idea what one like that runs?