A Spin-Off reader called me wanting to know if I knew of a machine
(affordable and not just for industry) for making pencil roving–she
said hand-cranked would be fine. I haven’t heard of one–but thought I’d
ask you knowledgeable people–perhaps you know of one. Or could invent
--Amy Clarke Moore
I take roving off my drum carder with a diz, starting at one edge and rotating the carder around and around. Normally I take it off at roving thickness, but one time I did start with a smaller diz hole and take a thinner slice, for something closer to a pencil roving. I suppose if one used a diz with tiny holes, you could actually take off pencil roving this way.
If you want pictures of the process, there's a tutorial on my flickr here:
How to take roving off a drum carder
I've not heard of any home machines for turning roving into pencil roving -- the industrial machines are all attenuating the roving out, similar to manual pre-drafting. I think it's basically two sets of rollers like the rollers on old squeeze-the-water-out washers, moving at different speeds -- it's very likely someone could build one out of stock pieces, with two separate speed controls/motors, one on each set of rollers.
This makes me think that I can do this... your flickr demo.
Thank you both one for asking my question and the other for the clear cut answer. I just came up with the question today and was really glad to see the answer was just waiting out there in cyber space for me.
What would I do without my friends at knitting daily.
I am off to try it. It seems so easy, that I don't need a pencil roving machine. I just use the carder that I already have.