I apologize for inappropriate language. The forum here is great because so much discussion and sharing comes from honest personal experience. Usually that gets the respect it deserves, but this time it didn't, even after going into length to try to be clear on it, and it's been my business. Yeah, prideful! The man never said he had used the system in question himself to know, so an argument about something I guess he had heard. So it pissed me off, my lame excuse for using the objectionable terms.
I'll take the liberty of adding to it, and maybe someone else will chime in on this particular aspect of the subject. Deva can easily figure out what works for himself if he tries different systems, but I will just say that though I can easily remove the rollers off my mill and put on some aluminum box, it has never occurred to me that there is any inconvenience with the rollers carrying the mill carriage, as opposed to some strip of stationary metal dragging against the surface of a wide log, especially with the weight of two power heads attached on occasion. The first mill I used didn't have rollers. With the current one, any pieces of whatever that may get shot up on top gets easily removed as part of the way of doing things without it altering the cut or stopping, as a general rule. I haven't heard a law against stopping. The vibration usually has whatever bouncing around and easy to pick off if it isn't getting pushed along, and I would say that the convenience of rolling along relatively friction free, well makes up for some attention there. Even a square edge without rollers can ride up over something if there is an easing up on the pressure, and dust will get under it with the irregular surface from a chain cut. It's not like a planer cut. A few things or more can go wrong when chain milling, it isn't a perfect system. God forbid a piece of bark should get under a roller! :roll: If with rollers someone had a problem, it wouldn't be any sweat to put a stiff bristle brush out in front, maybe not a bad idea with any mill.
I run my mill with the sprocket covers off, a fairly small wood block with round metal washer inserts embedded around the holes that the nuts screw down on, holds on the bar. It allows the ripping shavings and dust to shoot out unencumbered by the limited space under the cover, instead of loading up. Maybe also helps with the operation running a tad cooler. Recommended In Malloff's book. Still, any amount of dust getting under the rollers hasn't been a concern. The downside is that more revolving chain is exposed underneath. "Probably" cutting more wood doesn't make another person an expert on what has worked well for me, that I thought possibly helpful enough to suggest to someone starting out, and seemingly what has also worked for a lot of other folks as well. Anyway, after some footage or thousands of them, it is a mute point who has cut more. I know Bob Sperber pretty well, the guy that designed and produced those mills with rollers. He'd send me some choice pieces of wood from time to time that he milled in the east himself. There was some talk about a wider mill with additional rollers for more stability, but I don't know if he ever produced it beyond a prototype. At one point he was working on a pneumatic mill of some sort. These days he seems to be into plastics.
If the mill is narrow I don't see rollers as being so helpful, but something like a 3 foot wide mill using it yourself, the rollers are a good idea in my opinion. Two people makes life easier for sure, with a helper handle or an additional engine. For pulling off wide thick planks, working with a buddy is good indeed.