MM140 vs. MM140as

[jsh40sw]

I have been looking at these machines for quite some time now and have a few questions. The specs given in the catalog list quite a difference in wire feed speed(MM140= 40-500 IPM / MM140AS= 15-390IMP) . I was wondering if this has any advantage when using these machines in manual mode? Also noticed that the MM140 and the MM180 both list .024 as the min wire size while all other machines/feeders list .023 as min size. Is there any significance to this. Thanks for your input . Jere

[hankj]

Welcome aboard, Jere.

The "AS" models have the "auto set" feature. They can be run manually as well. The "straight" models (MM140) do not have an "auto set" feature. You have to set the votage and wire speed yourself. The advantage to manual adjustment is the ability to "fine tune" your arc for the task at hand.

There s no difference between .023/.024/.25. You'll see those numbers used interchangeably.

Hank

[jsh40sw]

Hankj,
Thanks for the reply.
I understand how the AS works I was just wondering about the difference in the ranges when the AS is off. It looks as if the AS will run slower down to 15 IPM but only up to 390IPM and the standard model runs 40IPM up to 500IPM. Do you think there is any advantage between the two if the AS is out of the picture? Thanks.

[Sundown]

I have a new MM140AS and I can tell you it welds great in either manual or Auto Set from 26ga thru 1/8" (all I have tried before the cold snap set in). In regards to the wire speed difference I doubt (I havn't ran the MM140 yet) there is any practical difference in the performance on either one, and the Auto Set is only a very few bucks more. If you get the Standard one you will have a choice of manual or with Wire Speed Tracking (which is not available on the Auto Set model, I would never use WST anyway as I never did like it on the previous machines).

[Danny]

I haven't ran a MM 140 yet, but the lower wire speed range on the 140 A-S, should widen out the range of travel a little on the wire speed pot that produces a good metal transfer for a specific voltage dial setting.

Honestly I don't understand why Miller worried about producing the MM 140. The A-S model gives you the option of a constant wire speed , and once you operate a unit in constant wire speed mode, I 'd be shocked to discover anyone that likes the unit set in a wire speed tracking mode instead.