[makipsee]

Hi I am VERY new to CNC machines (my boss just bought a STAR SB20R Type G a few weeks ago) and im looking for some help star designed the program for the part were making and everything has been going OK but we are having a problem with stringy chips building up on the boring bar. The boring tool is a Micro100 QBB-140600X solid carbide. let me know if u need any other info. Here is the process code

/M163
/T2300(FINISH BORE)
/(138 X .600 R/H BORE)
/G97
/G99
/(M25)
/G0X-.300Z-.05S3000M4T23
/Z.025
/G1X-.278Z.012F.0008
/X-.254Z0.F.0005
/X-.180F.001
/G0Z-.01
/M3
/X.2131
/G1Z0.F.0007
/X.194Z.0096
/Z.2056
/X.154Z.2286
/Z.450
/X.145
/G0Z-.05
/M173
/G0 T0 Z0
/M5
/G28W0.
M76
M1

[Benpen]

2 questions. First where is the chip building up? is it on the ID section of the bore or the OD section, it appears from your code that it does both. Second, if it's on the ID section, what are you drilling to before you bore? I'm very familiar with STAR machines. If you need more help, email me at [email protected].

[makipsee]

2 questions. First where is the chip building up? is it on the ID section of the bore or the OD section, it appears from your code that it does both. Second, if it's on the ID section, what are you drilling to before you bore? I'm very familiar with STAR machines. If you need more help, email me at [email protected].

The chips are building up on the boring bar its self. And yea we are drilling a hole first

[Benpen]

I know that you are drilling it first, what I asked is what size drill are you using? Changing the drill size could make a big difference. It may be that using a slightly smaller drill would allow the boring bar to achieve a better chip load and therefore work better. The other thing you could try is to put your boring bar in with the cutting face down. You will have to flip all of your x values but this will allow the chips to feed down into the chip try rather than up over the top of the boring bar before falling. Other than that you can adjust feeds and speeds. I would slow it down to like 2000-2500 rpm and go with more like .001 of feed. Again this depends on what size you are drilling to to begin with. That coated boring bar should be able to take it just fine in 304. I always run my sub spindle boring bars face down for just these reasons. I actually have a SB-20R type G in my shop.

[makipsee]

I know that you are drilling it first, what I asked is what size drill are you using? Changing the drill size could make a big difference. It may be that using a slightly smaller drill would allow the boring bar to achieve a better chip load and therefore work better. The other thing you could try is to put your boring bar in with the cutting face down. You will have to flip all of your x values but this will allow the chips to feed down into the chip try rather than up over the top of the boring bar before falling. Other than that you can adjust feeds and speeds. I would slow it down to like 2000-2500 rpm and go with more like .001 of feed. Again this depends on what size you are drilling to to begin with. That coated boring bar should be able to take it just fine in 304. I always run my sub spindle boring bars face down for just these reasons. I actually have a SB-20R type G in my shop.

lol sorry i misread what u wrote. It is building up on the ID section. the hole is being drilled to .150. since i have made the first post i made some adjustments to the code to try and help with the chips (below). we also bought a chip break boring bar QBT-120750 in hopes that it would help. tomorrow i will try flipping the bar and see if that helps... the other problem was that the chips were going right into the shoot and eventually parts would get stuck in there.

/G1Z0.F.002
/X.194Z.0096
/Z.100
/G0 X.190 Z0
Z.095 X.194
/Z.2056
/X.154Z.2286
/Z.350
/Z.340
/Z.450
/X.145
/G0Z-.05

[Benpen]

Well? did flipping it work?

[makipsee]

sorry i completely forgot to reply lol. with the QBT-120750 tool it was working very well no chip buildup or anything. but we had to switch to a QBB-140800 boring bar bc we ran out of the other and even with it flipped its pretty much making a steel wool bush on the bar... to help with it i have the high pressure trying to blow the chips off and it sometimes works other times not... my guess is that the chip are getting wrapped around the bar when it starts cutting the .154 diameter and the chips have no where to go.