1、GUNNAR Quick Reference Guide How to calibrate v-grooves in SPT32 by Jared Davis CPF, GCF HOW TO CALIBRATE V-GROOVES IN SPT32 Listed below are some technical suggestions that may assist you in “identifying“ where your problem is coming from, and potentially resolve any issues with cutting accurate v-
2、grooves. Please start with a new blade, and a new piece of matboard to make some test cuts. Blade Depth Please ensure that your blade is not cutting through too deep into the matboard. If you flex the matboard to pull apart the cut, you should not be able to see too much of the “meat” of the matboar
3、d. If the blade depth is too shallow, you will get residual “furry/fluffy” bits of residual matboard in the groove. Note: this could also indicate a blunt blade. Check Mode (for GUNNAR RAPIDO only) Activate “Check Mode” in your software settings (Settings Software Settings Machine) and set this valu
4、e to 3. Test cut a matboard and see if this improves the accuracy. VG Width Correction This setting (VG Width Correction) can be found in Settings Software Settings Cutter Settings. Changing this setting can slightly help with VG width registration. Test cut a mat between each change in this setting
5、 to compare the improvement. GUNNAR Quick Reference Guide How to calibrate v-grooves in SPT32 by Jared Davis CPF, GCF VG Calibrations for GUNNAR F1 / 601 / 3001 / 4001 only The standard width of a v-groove should be 1.4mm. If required, any variance in the width of the v-groove can be adjusted in the
6、 Settings Software Settings Cutter Settings by changing the value of the VG Width Correction. Make sure that the “auto adjust overcuts” checkbox is ticked too. From the front of a matboard, cut a small rectangular opening & a v-groove in a scrap, “test” piece of regular matboard, and inspect the v-g
7、roove for excessive overcuts or undercuts. Go to the Settings Cutter Settings Menu and find the “VG Overcuts” option window, and re- adjust the corresponding cuts by increasing or decreasing the values as required. You can increase or decrease this value accordingly, using the click arrows up & down
8、. Each click is equal to 0.1 of a millimetre. It is easier to calibrate the overcuts/undercuts, when you are working from an extreme “overcut” situation and work you way back to a nice overcut from there. You may need to cut more openings into a matboard to get this tuned perfectly. The ideal v-groo
9、ve should comfortably fall out of the matboard in one piece. GUNNAR Quick Reference Guide How to calibrate v-grooves in SPT32 by Jared Davis CPF, GCF VG Calibrations for GUNNAR RAPIDO only The standard width of a v-groove should be 1.4mm. When you are test cutting v-grooves with the “V-Groove Only”
10、check box (activated in the VG properties), as well as changing the blade, you also need to change the blade profile (at the bottom of the screen) from C3 Regular to C9 V-groove. Keep in mind, you may need to set the blade depth for your V-Groove Blade holder, especially if it cuts all the way throu
11、gh. See Step 1. If required, any variance in the width of the v-groove can be adjusted in the Settings Software Settings Cutter Settings by changing the value of the VG Width Correction. Make sure that the “auto adjust overcuts” checkbox is ticked too. From the front of a matboard, cut a small recta
12、ngular opening & a v-groove in a scrap, “test” piece of regular matboard, and inspect the v-groove for excessive overcuts or undercuts. Go to the Settings Cutter Settings Menu and find the “VG Overcuts” option window, and re- adjust the corresponding cuts by increasing or decreasing the values as re
13、quired. You can increase or decrease this value accordingly, using the click arrows up & down. Each click is equal to 0.1 of a millimetre. It is easier to calibrate the overcuts/undercuts, when you are working from an extreme “overcut” situation and work you way back to a nice overcut from there. Yo
14、u may need to cut more openings into a matboard to get this tuned perfectly. The ideal v-groove should comfortably fall out of the matboard in one piece. Straight Correction Straight Correction is the figure used to “offset“ the initial entry angle (measured in degrees) of the cutting head, to get i
15、t to cut a straight line. This can be adjusted individually for each profile of matboard in the “define mat profiles“ directory (Settings Define Mat Profiles) Choose the C9 Profile, which should be labeled “v-groove” and try adjusting the “Straight C.” value in increments of 1 or 2 degrees at a time
16、. Perform a test v-groove cut each time to compare the improvement. Usually, the best straight correction value for your v-groove profile should be approx. 2 degrees less than your regular (C3) profile. GUNNAR Quick Reference Guide How to calibrate v-grooves in SPT32 by Jared Davis CPF, GCF Advanced
17、 Adjustments! (WARNING - For GUNNAR Technician Only!) Step Size Setting This is an advanced adjustment, and should be performed by a confident, experienced person. This is to check that the that scales for both X axis and Y axis in computer actually matches reality. To do this, take a full sheet of
18、matboard, place it on the cutting board & tell the machine the outside measurements are 800mm x 1000mm. Make 3 small windows (50mm x 50mm) at top left, bottom left & bottom right. Position them 50mm from the sides of the board. Cut them out (from the back!) & measure “step size x” & “step size y.” M
19、easure these with a very accurate ruler. (Tape measures are not good enough). These measurements need to be accurate to at least 0.25mm These should be 800mm & 600mm exactly, respectively. If one or both are not exact, then adjustments must be made. A “New Scale X” has to be put into the spt32.ini f
20、ile. The formula for this is: (Old Scale X) x (expected measurement) (actual measurement) In other words, (“Old Scale X”) x (the expected measurement) over (the actual measurement). To find the “Old Scale X” go to the Spt32.ini file & search for scalex and scaley (usually = 340). Calculate the “New
21、Scale X” (in this eg, 340 x 80 over (say) 80.5. This number should be calculated for up to 4 decimal places (eg: 339.7652) You can look up the Step Size Formula in the Help File: Settings Help Configuration Assistant Index Step Size How to Adjust the Step Size.) Enter the new number in the Spt32.ini
22、 file, replacing the old one. Then save the changes. Do same procedure for step size y. Shut down software and machine after doing this & restart. Test cut another mat and check the adjustments. If this is now correct, test cut a v-groove and see if you have any noticeable improvement. Roller Bearin
23、gs Sometimes the roller bearings in the cutting head and carriageway can be slightly loose, and may need tightened or replaced. Replacement of brass planetary gears in servo motors (GUNNAR RAPIDO ONLY) Servo motors can have either brass or nylon gears. Nylon gears are not as durable as brass gears, but they do have the advantage of being slightly more accurate than brass gears. 99% of Rapidos have Brass Gears, because they are indestructible. This should be taken into consideration if you wish to change over to nylon gears.
