SQT15MS T-Plus Mill line not straight

ManualEd · Feb 5, 2020

Hi All,

Tried milling a hex on this thing for the first time.
Although the book says that it should auto comp for the cutter diameter, I had to offset my ½" endmill by ¼" to get the correct size.

Using a LFT Face option. I have an STP for the first line, and after that all lines for a FPT-R and an angle.

For some reason the flats on the hex aren't a straight line, but are rounded

Anyone experience this before?

Thanks!

tspiszak · Feb 5, 2020

Did you type in, in tool data, tool diameter?

Sent from my D5803 using Tapatalk

ManualEd · Feb 5, 2020

tspiszak said:
Did you type in, in tool data, tool diameter?

Sent from my D5803 using Tapatalk

Yup, I uploaded a few photos of the program and tool datas.

I've tried removing the ¼" cutter comp, but still the same radius of a hex.
It's got me stumped for sure.

Philabuster · Feb 5, 2020

ManualEd said:
Although the book says that it should auto comp for the cutter diameter, I had to offset my ½" endmill by ¼" to get the correct size.

How did you set X geometry for the endmill? That is usually the problem.

ManualEd · Feb 5, 2020

Philabuster said:
How did you set X geometry for the endmill? That is usually the problem.

At first I had it set from the center line offset I have scribed on the live tool unit.
That made my hex ¼" smaller than it should be. I tried a +.25" offset for wear, which didn't help.
Tried subtracting ½" from the actual tool offset number, which didn't help.

The only thing I didn't try was milling a .25" larger hex to comp for the problem.

Would programing by XY coordinates instead of degrees help with anything?

Thanks for the replies!

Philabuster · Feb 5, 2020

ManualEd said:
At first I had it set from the center line offset I have scribed on the live tool unit.
That made my hex ¼" smaller than it should be.

You need to set the endmill the same as you would set a drill. X0 is centerline of the endmill. You set it correctly the first time.

Also, I think you are programming it incorrectly. What size hex are you trying to make? You need to program to the corners of the hex and not the flats.

Your program with .87" on the hex will make a hex with a distance across the flats at 1.507". If you are trying to program a hex of 1.74" across the flats, you need to change your program to 1.004" on each line.

ManualEd · Feb 5, 2020

Philabuster said:
You need to set the endmill the same as you would set a drill. X0 is centerline of the endmill. You set it correctly the first time.

Also, I think you are programming it incorrectly. What size hex are you trying to make? You need to program to the corners of the hex and not the flats.

Your program with .87" on the hex will make a hex with a distance across the flats at 1.507". If you are trying to program a hex of 1.74" across the flats, you need to change your program to 1.004" on each line.

Oh FFS.

When I looked at this sample program in the manual, I thought it was 70mm across the flats of the hex, but its 70mm across the CORNERS. I feel like a putz.

When I let it run the first time and it milled a tiny hex, it looked pretty good to me.
I think this should solve the problem.

Thanks a lot Phil!

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