I've read that long screws have problems at speed because they tend to whip about. So, how long would be practical for lead screws listed on the main site (https://www.buildyourcnc.com/item/mechanical-leadscrews-lead-screw-!5-5-starts-10-tpi), that are 1/2 inch, 5 start, 10 TPI? For example, do you think it might work well to have a 4 foot run, perhaps about 5 feet in total length? If the regular steppers (also on the main site) are utilized, what do you suppose a maximum practical feed rate would be? I'm guessing I wouldn't be able to jog around at 300 IPM, but how about cutting at 100?