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Model Forum / General / Models / August 2005hemmingway kit for low speed drive for VMC mill question
Hi, Hemmingway do a kit (poly-V drive belts and new pulleys) for the "Myford VMC" mill that is advertised as giving a 50rpm bottom speed in place of the standard 160rpm. Has anyone here used this and have any comments ? I'm also interested to know if it reduces or increases the top speed at all, and if so what speed range do you end up with ? Also, does the entire kit fit within the existing belt cover when it's closed ? My mill will be a Warco VMC but AIUI they are identical to the VMC Myford were selling, I'd be particularly interested to know the experiences of Warco owners though... Thanks, David Have you spoken to Hemingway? I have always found Kirk Burwell hones and straighforward in discussing his kits -- Myford Mat > Have you spoken to Hemingway? I have always found Kirk Burwell honest > and straighforward in discussing his kits. [quoted text clipped - 4 lines] > Myford Matt's Profile: http://www.rcgroups.com/forums/member.php?action=getinfo&userid=66196 > View this thread: http://www.rcgroups.com/forums/showthread.php?threadid=405708 Why not fit a variable-speed inverter? Mine allows speed to vary from a few r.p.m. upwards. Continuous variation allows fine speed adjustment for smoothest cutting. >> Why not fit a variable-speed inverter? Mine allows speed to vary >> from a few r.p.m. upwards. Continuous variation allows fine >> speed adjustment for smoothest cutting Interesting idea but it is a new mill with single-phase motor and I don't really want to swap it out for another one. I might consider that approach if/when the motor dies. As a matter of interest, what is the low-speed torque like with the inverter ? Thanks, David > >> Why not fit a variable-speed inverter? Mine allows speed to vary > >> from a few r.p.m. upwards. Continuous variation allows fine [quoted text clipped - 8 lines] > > David Torque remains fine down to ten or so r.p.m. This is very handy for turning: especially thread cutting up to shoulders. You can use the speed control to stop the work within a few degrees of the required thread end. Also useful for knurling under power. I had this one fitted from new, five years ago. I've only moved a belt once since - to get a higher maximum speed. Given the motors are often fan cooled do you get any overheating with hi loads and very low revs? Steve >> >> Why not fit a variable-speed inverter? Mine allows speed to vary >> >> from a few r.p.m. upwards. Continuous variation allows fine [quoted text clipped - 19 lines] > once > since - to get a higher maximum speed. I pull the fans off my inverter controlled motors, and fit PSU fans instead. They are wired so whenever the motor is on, even if it's stalled (very low speed) you still have full airflow from the fans. Joules >> Have you spoken to Hemingway? I have always found >> Kirk Burwell honest and straighforward in discussing his kits. Yes, I spoke to Hemmingway a while back but he couldn't tell me whether the kit would fit under the existing drive cover. I presume it will but... I am really more interested in actual owners experiences and am curious to know how well it works in practice and what the useable speed range ends up as. Thanks, David There was an article in ME a while back to do this, and IIRC the cover would not fit over the new large pulley. The articel should be on the shelf, I'll give you a reference if I can find it. Steve >>> Have you spoken to Hemingway? I have always found >>> Kirk Burwell honest and straighforward in discussing his kits. [quoted text clipped - 10 lines] > > David >> There was an article in ME a while back to do this, and >> IIRC the cover would not fit over the new large pulley. The >> articel should be on the shelf, I'll give you a reference if I >> can find it. Hi, Thanks for replying, I was already aware of the ME article and had decided not to do it that way because of the issue with the cover. AFAIK the Hemmingway kit is a completely different design but I still don't know whether it fit under the cover :-/ David I have already pre-planned this mod too, even though my VMC hasn't arrived yet (due this week I hope) as it should give a useful lower speed for large flycutting and so on, so please keep us posted with what you find out. Peter |
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