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{{sized-external-image|470px|https://cdn.evilmadscientist.com/wiki/eggbot/extensiontut/ext4b_timing.jpg}} | {{sized-external-image|470px|https://cdn.evilmadscientist.com/wiki/eggbot/extensiontut/ext4b_timing.jpg}} | ||
| − | + | The "Timing" tab controls how fast the Eggbot's motors and pen arm servo operate. The speeds are adjustable, and there are always tradeoffs between higher speed and higher quality. At too high of a speed, your plots will lose precision. Lower speeds mean that your plots will take longer to complete. | |
==== Speed when pen is down ==== | ==== Speed when pen is down ==== | ||
| − | + | This setting controls the maximum number of motor steps per second which may be taken by either or both stepper motors. (The distance around your egg -- or other object in the EggBot -- is exactly 3,200 steps around the equator, and about 800-1000 steps vertically.) The default value of 300 steps per second is a fairly good choice. If you want to get a quick sketch out as a "draft", you can use a faster value, up to perhaps 1000 steps/s. | |
| − | + | To get a feel for the effect of different speeds, you may wish to comparing a plot at 150-200 steps per second with one at 400-500. The speed that works well for you will depend (amongst other things) on the model of EggBot you are using -- the Ostrich EggBot needs to be operated more slowly -- and on what kind of a tool you are using. Permanent marker pens can draw quite quickly, but using a tool like the diamond engraver requires a very slow speed for good results. | |
==== Speed when pen is up ==== | ==== Speed when pen is up ==== | ||
| − | : | + | This setting controls the maximum speed at which either or both stepper motors can operate while moving the raised pen between locations over the drawing surface. You can use much larger values than the pen down speed without compromising the quality of your plots. However, there is an upper limit to how fast you can go: At too fast of a speed, the pen or egg could slip position, ruining your plot. |
==== Pen raising speed ==== | ==== Pen raising speed ==== | ||
| − | + | To control how fast the pen is raised, change the "Pen raising speed" value. This value controls how many percentage points the pen is raised per second. | |
==== Delay after raising pen ==== | ==== Delay after raising pen ==== | ||
| − | + | After a pen-raise command is issued, the EggBot will pause for this duration of time before initiating another movement such as rotating the egg. The time to wait is specified in milliseconds (ms). This value should be set high enough to ensure that the pen is no longer in contact with the surface when the EggBot begins moving again. | |
| − | + | <p>''Technical note:'' The delay starts at the <i>beginning</i> of the pen's upward movement, not at the <i>ending</i>, so you may wish to compute the time that it takes the pen to move up. For example, let's say we have a pen up position U of 68, a pen down position D of 62, and a pen raising speed R of 50. We see we have (U - D) / R = (68-62)/50 = 6/50 = 0.12 seconds = 120 ms before the pen gets up. If you wanted (for example) 200 ms of additional delay after raising, set this value to 320.</p> | |
==== Pen lowering speed ==== | ==== Pen lowering speed ==== | ||
| − | + | This parameter controls how fast the pen is lowered between the pen up and pen down positions, specified in percentage points per second. Using a slower speed means that the pen will contact the surface more gently. | |
==== Delay after lowering pen ==== | ==== Delay after lowering pen ==== | ||
| − | : | + | After a pen-lowering command is issued, the EggBot will pause for this duration of time before initiating another movement such as rotating the egg. The time to wait is specified in milliseconds (ms). This value should be set high enough to ensure that the pen is fully contact with the surface when the EggBot begins drawing. |
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| + | <p> Technical note: As with raising the pen, the delay starts at the <i>beginning</i>, not at the <i>ending</i>, of the pen's downward movement. You may wish to compute the time that it takes the pen to move down. For example, let's say we have a pen up position U of 68, a pen down position D of 62, a pen lowering speed r of 20, and want a (very long) 250 ms delay after the pen gets all the way down. Referring to item 8, we see we have (U - D) / r = (68-62)/20 = 6/20 = 0.3 seconds = 300 ms before the pen gets down. Adding that 250 ms pause we want for settling, means we should actually set this value to 550. </p> | ||
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== Options タブ == | == Options タブ == | ||
