Mazatrol cutting direction

[ihbuilder]

I'm having some chatter issues on the inside face of my bore on the finish pass . How my mind thinks it should go , I can't figure how to get it to do in mazatrol . I would like to finish the profile Z in to corner the X out from .6" to corner . How to make this happen ? material is 6061T65 Aluminum

PICS

the profile

the chatter

screen pic of what I have

same as previous with more showing

tool used

what I what it to look like

I've just got in aluminum specific inserts in thinking it may have been just the inserts since the 1st few came out fine .

 

[Philabuster]

Your DCGT insert has only a 3° clearance on the face. How much stock are you leaving from the rough pass to the finish pass on Z (stock allow Z on PNo 0)? I would set it to .003" to .005" max.

Also, you are running an extremely slow feedrate for the finish pass using Rough 9 (.0017" IPR). I would change it to Rough 7 (.0039" IPR). These feedrates assume you have a R.031" insert radius. Too slow of a feedrate will certainly make tools chatter.

 

[ihbuilder]

Yes .005 is my finish depth . I'll try the 7 when I get new belts . I noticed slack in them and went to adjust to find out there is no more adjustment left . I just learned if belts look "OK" they probably aren't . I'm guessing that could be part of issue along with my tapping issues ?

Steve

 

[Captdave]

I'm guessing that could be part of issue along with my tapping issues ?

Most encoders have a seperate belt to the spindle that should keep it in time. Not tapping to depth or rough threads from the Z axis "jerking" could be symptoms of belt slippage.

 

[ihbuilder]

Most encoders have a seperate belt to the spindle that should keep it in time. Not tapping to depth or rough threads from the Z axis "jerking" could be symptoms of belt slippage.

Hmm , Problem is on bottom tapping (with floating tap holder ) it would bottom out and snap before reversing with less then the desired depth in the program . Single point threading is a breeze (no issues) Iv'e got some M2 coming up in a month or so that I'll be back to trying it again .


Phil , big help, thank you . I Changed the feedrate and insert now waiting for the inserts for the smaller bar .

 

[Captdave]

Hmm , Problem is on bottom tapping (with floating tap holder ) it would bottom out and snap before reversing with less then the desired depth in the program . Single point threading is a breeze (no issues) Iv'e got some M2 coming up in a month or so that I'll be back to trying it again .

If the tap is going to the bottom before the spindle stops it will snap every time. You'll have to fiddle with the Z depth amount to give the spindle time to stop before it hits the final Z depth and not the bottom of the hole. How much less in Z? that will depend on many variables from spindle speed, material hardness, type of tap and TPI.

One trick to try is to see if you can configure your tap holder to a hard start, meaning it will not compress and starts cutting at the same point/depth each time. Some holders you can remove the compression spring and it will just have more travel other you can't. This will eliminate the tap compressing into the holder different amounts before it starts cutting and will give more consistent thread depths even as the tap wears.

 

[Mad Mazak]

Deduct the lead of one tread from tap depth. Try that.

 

[ihbuilder]

Mind block

I'm having a mind block on this 1 I think I have it put in how it would machine Where am I wrong ?

what part should look like

 

[Spinit]

Just looking at the pictures it looks to me as a insert geometry issue or if you are using a inserted drill you may have a issue with that going too deep.

 

[xa-mont]

Maybe a bit OT but is that a little mini Alcoa rim?

 

[ihbuilder]

Maybe a bit OT but is that a little mini Alcoa rim?

yes as in close and no as in name they're 1 of my product lines for 1:14 scale RC semi trucks .


I had to change my bar geometry in my tool settings for different bar .

ISCAR Cutting Tools - Metal Working Tools - S/A-SVJCR/L : 3695394 - S16R SVJCR-11

I'm still not happy so may try a different approach . I was trying to do my radi with corner R and it seems to be missing them even though they come up on the screen

 

[xa-mont]

yes as in close and no as in name they're 1 of my product lines for 1:14 scale RC semi trucks .

Awesome! got any more pictures of your mini Not-at-Alcoa rims?

 

[zak300sy]

There is a parameter for "reverse feed tolerance" I think it's U36 on a T+ control. Controls how far you can back up with a BAR IN type process. That TPR in line 4 could cause the error since it is backing up in Z. Lots of start & fin corner radii also could cause that issue. Delete them & add in one at a time, see if there is a particular one that causes it. Other programming option is to use BAR FCE (highlighted), it's designed to profile on a face like what you're doing in this example.

 

[jimmyb]

zak300sy is right. Parameter U36 needs to be great than .0746". Make U36 2000 (2mm) and that should do trick. It's been over a week since that post, so you must have got it going?