Coordinated Motion Moving Slowly

[BrandanS]

Hey ShopBoters,

I am having an issue where I am cutting a radius at the end of a part in small steps in two locations. Associated with these radii is a lead in and out of the part due to the geometry of the part. When the cutter is engaged in the part, Movement Speed react as to what I have programmed them at, but the lead-in and outs from the part move WAY too slowly. The leads are arc's tangent to the part I am cutting.

I have checked the program and there is no MS command which is causing a change in feed speeds, it seems to be something due to with a parameter on the ShopBot and occurs when I am doing the lead-in and lead-out only. I am also cutting two c'bores in this operation wherein I am getting the same symptom.

Is there a way to control the speed at which the ShopBot performs a co-ordinated motion or disable it for the time being? I am running on a PRSalpha and have attached code for your review. My Post-processor has generated point-to-point code, and does not use commands such as CG.

Thanks,

Brandan

[srwtlc]

Hey Brandan,

Since those lead in/out segments are so short before it gets to the radius, they are run at the setting for XY ramp speed. You can do some testing to see what works best for you by going to the ramp settings (VR) and do some tweaking to the settings there. The settings in particular that you would want to try are...XY ramp, move ramp rate, minimum distance to check, and slow corner speed. I'd try one at a time, starting with XY ramp speed, to see the effect on the motion and then add in the next setting to see the combined effect. Here's (http://www.shopbotblog.com/index.php/2008/03/a-ramping-the-vr-command-and-how-to-tune-your-tool-for-maximum-performance/) good primer on ramp settings.

I'd recommend saving out the original settings with US first and also save them when you find some custom setting that work for you. You can then take those saved files and strip out all but the VR line and save as a .sbp file that you can then run at any time to swap settings. You could call this file at the beginning of any file you want to use them with or set them up as custom cuts where you could choose from any of them from the Cuts menu item.