It’s a frequent downside for stone kitchen and loo countertop fabricators that their CNC machine leaves seen traces after profiling the marble or granite edge which leads to a not so shiny end as desired.
The traces are unavoidable on profiles with a big flat part just like the ‘T’ profile but in addition on all the opposite profiles roughly. How seen the traces are is determined by various factors. One is the stone itself regardless whether it is pure stone like Granite and Marble or artifical (engineered) stone. The CNC diamond instruments are one other massive issue of the ending end result. With model new diamond tooling the traces are minimal however finally they’ll develop traces which are noticeable and unacceptable for many stone fabricators and their shoppers.
On some profiles and stones it’s attainable to restrict the traces to a minimal by operating the sharpening wheels forwards and backwards 3-4 occasions and altering the Z worth up and down by a minimal quantity (0.005mm) for each run, which could not be attainable to do with each profile.
Another choice is to manually run a 400 grit pad after the CNC has run all of the steel wheels and earlier than the sharpening wheels. That helps to maintain the sharpening instruments in fine condition however it’s further handwork which disturbs the conventional workflow on the CNC machine.
Dressing the profile diamond wheels frequently with the precise dressing stones will assist to maintain the traces to a minimal.
There are additionally particular instruments known as line-breaker and line-buster to call a couple of which can lead to a greater end.
When you evaluate the hand polish course of with the best way the CNC machine works on a profile then you could acknowledge the place this traces are coming from and why it’s laborious to eliminate them. On the CNC Machine the instrument is spinning in the identical course because the machine motion. There is no such thing as a cross motion of the instruments and the CNC machine motion.
Simply see what occurs once you hand polish, the instrument spins throughout the motion you do by hand. That motion is what removes the traces and that isn’t attainable with a CNC machine till somebody designs a machine head which works the identical method as hand sharpening. It’s uncertain that that is even attainable.
You can not actually evaluate a “T” or “V” form profile produced on a CNC to a profile polished by hand or a line polisher machine. The profile from the CNC isn’t as shiny and can have to be touched up by hand in order for you a top quality end.
TIP: In case your CNC machine is provided with a noticed gearbox than you will get an adapter made to connect the usual magnetic draining-board sharpening instruments to run them on the T-Profile. Offered your CAD-CAM-CNC software program means that you can program that appropriately particularly the entry and exit of the instruments are important, to not crash the machine. The result’s virtually excellent however the arris or pencil spherical nonetheless must be completed off by hand after.