does anyone know the max speed you are allowed to scan with one of these?
The maximum speed is based on the point density you require and the sampling rate of the controller.
If you want to measure 10 points per millimeter and your controller can only sample 1 point every 0.1 second than your maximum scanning speed is 1mm/sec. The sampling rate is based on what kind of detail you are trying to capture.
I believe the B3C controllers sample every 10 ms (you should verify this). If the scanning speed or density is set higher than the controller can handle it will interpolate between samples trying to provide the density you are asking for. You could end up with a square hole if you set the speed high enough (unlikely but theoretically possible).
I would try and get the spec sheet for that model probe. Most scans are determined by feture size. Larger the Ø, faser you can scan. Linear scans will be even faster.
I read the manual and everything... it doesn't say max speed at...just max weight and max length... but that you for the input....so if I have a cylinder that is 7.420" dia. and it is 1.740" in length... what would y'all do?
I go with ( this is the overly simplified version mind you with MY LSPX-1s ) FEATURE Ø / 5 ( IN Millimeters ) But this is a huge surface / Ø. Looking at my LEVEL 2 DMIS book. It also says never go over 25MM /sec on UNDEFINED scans or over 150 for defined scans ( basicly taken from a cad model or learned from the part ). That being said your part would be 7.42 = 188.5 MM / 5 = 37.7. THats sounds crazy fast to me. BUT, most parts I deal with are ( aluminum extrsusions ) and are never larger than 6 in sq cross sectionaly so most features that I scan are smaller bores/holes. If I am scanning a surface , i have never really scanned over 10mm/sec. This is another good example of why you should also be running your CMM in MM/SEC vs. % speed. All the scanning formulas are based on MM/SEC. ( F5 / PART/MACHINE TAB / CHECK DISPLAY ABSOLUTE SPEEDS )
I read the manual and everything... it doesn't say max speed at...just max weight and max length... but that you for the input....so if I have a cylinder that is 7.420" dia. and it is 1.740" in length... what would y'all do?
Using the diameter of 7.42" (188.468 mm) then the circumference of each cylinder section is 592.089 mm and assuming the controller is sampling at a rate of 0.02 seconds:
. Setting the point density at 2 points per millimeter the maximum scan speed should be no higher than 25 mm/sec and should return 1184 points for each cross section of the cylinder.
. For 10 points per millimeter the maximum scan speed should be no higher than 5 mm/sec and should return 5921 points.
If you try to scan faster than this the controller will return interpolated data between the hits as the machine is moving faster than the sample rate permits. The interpolated points will be a straight line between the actual measured points which you probably don't want.
Upon some reflection I believe the B3C controllers samples the probe position at intervals of 0.02 seconds (not 0.01 seconds as previously posted). This should be verified regardless.
Your probe won't have any specifications for scanning speed; the scanning speed limits are based on your controller and machine (parameters).
Using the diameter of 7.42" (188.468 mm) then the circumference of each cylinder section is 592.089 mm and assuming the controller is sampling at a rate of 0.02 seconds:
. Setting the point density at 2 points per millimeter the maximum scan speed should be no higher than 25 mm/sec and should return 1184 points for each cross section of the cylinder.
. For 10 points per millimeter the maximum scan speed should be no higher than 5 mm/sec and should return 5921 points.
If you try to scan faster than this the controller will return interpolated data between the hits as the machine is moving faster than the sample rate permits. The interpolated points will be a straight line between the actual measured points which you probably don't want.
Upon some reflection I believe the B3C controllers samples the probe position at intervals of 0.02 seconds (not 0.01 seconds as previously posted). This should be verified regardless.
Your probe won't have any specifications for scanning speed; the scanning speed limits are based on your controller and machine (parameters).
I may be mistaken, but I thought the B3C can sample 200 points/second, which means one sample every 0.005 seconds.
I may be mistaken, but I thought the B3C can sample 200 points/second, which means one sample every 0.005 seconds.
I believe this is true for some controllers (Zeiss? I read something about a non-Hexagon controller sampling at 0.005 seconds a while back). Unless there is documentation to the contrary I believe the B3C controller has a 0.020 second sample rate. I do have something about this but I can't find it.
Maybe the machine specifications have the maximum scanning rate listed somewhere?
