Adding angles and Tip Calibration

[Jhart]

I know this is probably a easy fix but I am a rookie at programing so please excuse my ignorance. I want to add a tip angle (T1A90B0) to an existing probe file in a new program that I am writing. This Probe File already contains tip angles at forty-five degree increments (T1A90B +/-45 to +/- 180). I can add the tip angle that I want but when I go to calibrate it the probe fouls (Interupted Movement) on the forth point of contact on the calibration sphere. The calibration is set to take thirteen points per tip and all of the other tip angles run through calibration with no problems. I did notice that when going to the fourth hit in calibration of this tip the CMM speads up. How can I get this tip angle (T1A90B0) to calibrate? Thanks.

[Cincinnati Andy]

Try calibrating T1A0B0 first then the new tip angles. What version are you using?

[John Riggins]

Take a look at the "Similar Threads" section at the bottom of the page.
See the thread: Adding probe angle.

[Jhart]

Andy,

I am not quite sure what version we have. I am not at work right now so I can't look it up. But I know my company bought the CMM in 2000. I'll give your suggestion a shot first thing tomarrow morning. Thanks.

John,

Thanks for the Tip. (Pun intended)LOL!

[EHines]

You may also want to check that your head is mounted square. I have run into similar problems when my head gets out of square to the machine. It is usually in the A90 and B0,90,180,-90 that I see issues with squareness.

[Underspec]

Did you answer "yes" to the cal sphere has been moved question?

[jkb_mcg]

You may also want to check that your head is mounted square. I have run into similar problems when my head gets out of square to the machine. It is usually in the A90 and B0,90,180,-90 that I see issues with squareness.

And how would you fix it if it was out of square? Would this affect the calibration of the machine?

[EHines]

What you would be looking for is the squareness of the Renishaw head to the rest of the machine. On anything but the MQ models you should be able to loosen a couple of bolts and adjust the head square. I am not sure about the MQ models as I have never worked on a machine with one. Try a "pencil" test to see if the head is square. In a 0,0 rotation align your probe directly over a pencil tip or other pointy object. Move the probe streight up and rotate to 90,0. Move the probe in only one axis and check to see how close your probe is to your suitably pointy object. You should be able to "eyeball" it close enough for your calibration to take up any error. After you realign your head you will have to re-calibrate your probes, but that should be all you have to do.

[#2#]

And how would you fix it if it was out of square? Would this affect the calibration of the machine?

The 'out of square' condition would be compensated for during the tip qualification.

The problems associated with having an out of square head are that the movement of the machine is not perp/parallel to the probe. It increases your chances of shanking the probe. It makes it more difficult to manuever during manual hits. It makes it more difficult to set a part up square to the tip (to avoid shanking).

I have a PH10MQ head. I have successfully adjusted it by loosening the 4 screws which mount it to the z rail. I used the smallest tip on the longest extension I have (20mm on something like 80mm ext.). I compared its location to a same size tip attached to a tp20 module and stuck on a steel plate to keep it from moving. Using two same size small spheres makes it easier to 'line up' the spheres center to center.

[chainfeed]

Just make the retract .25 or something huge then it will have plenty-O-room.... or just make sure the head is square like the other people said.

[John Kingston]

I know this is probably a easy fix but I am a rookie at programing so please excuse my ignorance (not hard for me to do, I am used to it!). I want to add a tip angle (T1A90B0) to an existing probe file in a new program that I am writing. This Probe File already contains tip angles at forty-five degree increments (T1A90B +/-45 to +/- 180). I can add the tip angle that I want but when I go to calibrate it the probe fouls (Interupted Movement) on the forth point of contact on the calibration sphere. The calibration is set to take thirteen points per tip and all of the other tip angles run through calibration with no problems. I did notice that when going to the fourth hit in calibration of this tip the CMM speads up. How can I get this tip angle (T1A90B0) to calibrate? Thanks.

Andy,

I am not quite sure what version we have. I am not at work right now so I can't look it up. But I know my company bought the CMM in 2000. I'll give your suggestion a shot first thing tomarrow morning. Thanks.

John,

Thanks for the Tip. (Pun intended)LOL!

First of all, learn to spell. Nothing ticks these guys off more than poor spelling and grammar. I think you learned to spell from that guy who sits up near the window in your office.

You could've looked at my profile here to figure out version. (V3.2063)
BUT NOOOOOOOO! You had to give this bunch reasons to pick on you.

LOL ! Just kidding.

I will look at this tomorrow Jason, almost done with the parts that I am running. I will call you down here when I start.

John

(Oh yeah, bad puns are my territory. Stay out!)


For the rest of you:

Beer , Whiskey, Root Beer and Scroll Lock.
There is no problem, keep moving.

[craiger_ny]

Who trained that freaking guy?

[John Kingston]

Who trained that freaking guy?

I asked that same question!

[Jhart]

Cleveadian John a.k.a. Queen of the Spelling Bee,

Working with you is like having a wife at work. "Nag, Nag, Nag, its not good enogh, you never do anything right," and all that stuff. By the way, is Cleveadian even a word?LOL!

Everyone else,

Thank you for your fast and courteous responses to my post and I apologize for not being smarter than a fifth grader. LOL!

[[email protected]]

I to have run into this problem I agree with underspec first thng you should do is answer yes
to cal sphere being moved this will prompt you to take a hit top dead center on cal ball usually this will allow machine to correct for error.