Thank you so much, indeed quite handy

Thank you. We have a PLC based Honing Machine. Slide movement to bring down honing cutter close to component, movement of honing tool inside bore and expansion of tool for finish honing, all these three functions are hydraulic, position feedback thro Servo. Bore length is 200mm, sometimes, we find black marks/rings ( 2 or 3) on top of bore but this mark not effecting surface finish Ra, flow of cutting oil adequate. Unable to understand reason for black mark. After replacing tool, no mark found but we are unable to conclude reason for such mark

Hello Mike, although I know u support immensely on CNC application related issues, was wondering if u can guide on Application related issues of Honing machines as well, please comment

Hello Mike Please recall issue related to Waviness. Please confirm if there is any way in Siemens 840D SL with Sinamics Servo drive, to find waveform with respect to axis movement so that waveform wud be slightly different in case of any mechanical issue/obstruction as it was due to minor issue in LM Carriage Regards

Thanks, sent an invite to u on linked in

Thanks Mike your responses do help me a lot. Yes we are in touch with OEM as well, as u rightly mentioned encoder might well be reason, we would replace and revert. R u on Linked in, if yes please share your coordinates as well as contact details, if u r okay to share as I want to connect with u

Hello Mike Could u please respond to me

Thanks for your response. Sorry for not having informed you that it is a pretty old machine as well as process. In fact most of the machines as well as processes are pretty old and tailor made for such operations. This machine was not having proper levelling since inception ie for about 15 years and as a result machine itself used to drift a little on the floor and as a result relationship between Gantry and fixture used to get disturbed but out of 10 other stations, process parameters used to be the best out of this station. We have done proper levelling of the machine but this again, in our opinion, can not have this sort of issues Mike There is no crash on the machine What machines the surface into which the bore is machined? - basically we get semi finished components from supplier and we do finish operations. Again exactly similar semi finished components being finished in other similar machines as well hence we can not doubt the precondition here. I think out of about 20 jobs, 6 to 7 had variance upto 1 mm Regards

After replacing LM blocks, results quite satisfactory and Wc well within limits. Thank you so much for your support

Thanks, we plan to replace spindle and LM blocks of Z axis, shall revert back

Thanks for your feedback 1. It was doing fine, we have problem since last two months - not a new process 2. L/D ratio should be fine Shall revert with other details