Siemens 828d Post Processor For Mastercam -

Most CNC controls read G-code line-by-line in a modal fashion. The Siemens 828D, however, operates heavily on software boundaries and parameterized cycles (CYCLE83, CYCLE84, CYCLE832). It also uses different codes for High-Speed Machining (HSM).

The post should convert Mastercam’s standard drilling and tapping operations into Siemens cycle format, not long-hand G-code. This keeps the program size small and allows the operator to edit peck depths or dwell times easily at the control.

Siemens handles plane switching differently for drilling cycles. A standard post may crash on a 5-axis or right-angle head operation. The 828D post must properly handle PL (Plane selection) commands. siemens 828d post processor for mastercam

In this article, we will break down why the 828D requires a specialized post, the critical features you must look for, and how to troubleshoot common output issues.

| Error on 828D | Likely Cause | Mastercam Fix | | :--- | :--- | :--- | | "Axis not configured" | Post output A or B instead of C . | Verify rotary axis labels in the post (Rotary Axis Settings). | | "Drilling cycle incomplete" | Missing RTP (Return plane) or RFP (Reference plane). | Update the post formatting for drillcyc block. | | "Wrong G code" | Post output G84 for tapping. | Force the post to output CYCLE84 instead of G84. | | "Spindle speed missing" | M03 issued before S word. | Change the order of output variables in the post (S before M03). | Most CNC controls read G-code line-by-line in a

MCALL CYCLE83(1., 0., 1., -25., , 1., , 1., 1., 1., 1., 1., 1.) MCALL CYCLE84(1., 0., 1., -12., , 1., , 1., 1., 1., 1000., 2000.) MCALL Notice how the Siemens post uses MCALL to activate the cycle and parentheses for all parameters. This is what makes the 828D so powerful.

Even with a good post, you might see errors. Here is a quick troubleshooting guide: The post should convert Mastercam’s standard drilling and

Do you use a Siemens 828D with Mastercam? Share your biggest post-processing headache in the comments below.

The 828D distinguishes between external subprograms (calling another file) and internal subprograms (LABEL jumps). Your post needs to output CALL commands correctly based on how you set up your Mastercam subprograms.

When purchasing or customizing a post for the 828D, ensure it includes the following:

If you are programming a lathe or a mill-turn with the 828D, the post must support Siemens ShopTurn commands. This allows for graphical simulation directly on the CNC screen without back-plotting.