Messages

31

Show"N"Tell ( Your Machines) / Re: emco 5pc spindle motor help

« on: October 19, 2007, 01:55:26 PM »

2hp on an Emco Compact 5?   Seriously you don't need that, the original motor would have been well specified.  I'd even go as far to say that 1/2 or at a push 3/4 hp would be good enough.

As Ian says a 3 phase induction motor and VFD would be perfect.

Bear in mind the headstock on a Compact5 is only diecast aluminium and the bearings standard deep groove ball races,  there's a limit to how much power you can put into that setup.

Wayne....

thanks for the replys gents, yup 2hp is a tad over estimated!,  i'm a novice with electrics although not a novice with machining,  i feel the motor it has needs some more power.   help please!:  the motor says 0.3kw the manual says 800w which is it?, id like to up the power to at least 750w, if its 300w?, i would also like to implement a belt drive system that allows me to keep the same belt all the time hence the need for more base power.
 
so i'd like a drive which enables to keep one belt on all the time, also a drive which wont cost me a 2nd mortgage, and easy to install for a  first timer,... will this be the 3 phase or how about a 180vdc servo motor with drive, can you show me some equipment?

32

Show"N"Tell ( What you have made with your CNC machine.) / Re: Been a while, been doing jewlery...... here are some.....pics...

« on: September 23, 2007, 05:35:51 PM »

superb work!

33

Show"N"Tell ( Your Machines) / Re: emco 5pc spindle motor help

« on: September 22, 2007, 05:50:25 PM »

i took the details from the existing motor:

single phase asynchronous
2650rpm
2.1 amps
240v
50hz
23-60% vde
0.3KW

i took these motor details from the manual:
power @ 60% duty = 800w
supply 220v/50hz/3.3A

just for further ref, feed motors,
rapid700mm/min, (although i'm running 498mm/min max through mach right now)
 5 degrees/50ncm/0.37lb/ft
feed power approx 1000N / 225lb/ft. 

34

Show"N"Tell ( Your Machines) / Re: emco 5pc spindle motor help

« on: September 20, 2007, 06:26:05 PM »

electronics guru haha, made me titter, i just liberated my machine as i do with most mechanical stuff!.    broken into laymens well   
 pulse width mod to voltage, i can understand that logically thinking. i can sympathise for not wanting to stop the motor quick, i guess its handy for square jobs that need coding to right side up / quick spindle brake on contract work, not necessary for round / home work!.   i like the IR comp feature, thats another on the list.

im not sure about regenerative or non yet, can i get a 'non-regenerative chopper drive with IR comp? sounds like the best of both worlds?
the spindle bearings and belt drive of such a system would take load there, i think it runs on 6309 bearings, assuming i would employ a decent timing belt and pulleys it cant be too much to replace.  can the drive handle the return of the power?

35

Show"N"Tell ( Your Machines) / Re: emco 5pc spindle motor help

« on: September 20, 2007, 05:23:29 PM »

ok, whats regenerative and non?   whats IR comp? and chopper drive!, and erm..  pwm to V convertor, sorry for the dumb questons, i'm not electrically knowledgable to this degree

36

Show"N"Tell ( Your Machines) / Re: emco 5pc spindle motor help

« on: September 20, 2007, 04:32:54 PM »

hey arnie,  yup i used the lathe conversion in the digital machinist article, its basically removing a chip and soldering 8 jumper wires..  astoundingly easy,  it does not involve changing any of the original motors / boards its almost plug and play. although it dosent convert the manual spindle control and belt/pulley drive.     i'll get the details off the motor tommorow i believe its a 240v a.c straight from the mains with contactor type control via a rotary switch, very basic!.


i have the emco pcmill50 aswell which was the newer version of the F1. that mill conversion was covered in that series of magazines but i can get by on the emco pcmill50 as it has a win98 interface so i'm coping with cad/cam translations o.k, ideally yes i'd love modern control with the mill50, but for now i'll have to get by.

i want some extra power from the lathe spindle, and also some extra speed, and just 'control' of it would be o.k i.e spindle on/off auto, and rather than building a relay box, id want mach 3 to control it all with pulses.   the standard motor HP is around 1.     i want maybe 2hp/1.5kw which is a lot for a tiny lathe!.. but should see me good for parting steel with ease

37

Show"N"Tell ( Your Machines) / emco 5pc spindle motor help

« on: September 20, 2007, 03:07:15 PM »

hi all,
 i'm needing some help on modifying my lathe spindle motor, i'm not sure if im in the right place to ask please let me know and move as necessary (new user)

 the machine is an emco compact 5pc lathe, and at the moment uses a .75kw 240v motor, i'm not conversant with electronics so please be gentle!. Ive just converted this machine to run mach3 using eugenes conversion (thankyou eugene) and your software here thankyou all, i'm very pleased so far and impressed with the functionality of mach.  but..  while imagining screw cutting op's / parting and general turning the speed of the carriage for threading at 2400 rpm would probably go through the shop wall.    i'm a time served toolmaker/machinist like most on here i would imagine... having to change belts half way through a job is defeating the object of putting feet up!.

 i need some advice here,  i need a quality spindle drive motor and drive equipment to interface with mach3  so i can utilise mach3 and the machine as a machinist intends        i would like to detail the steps here once complete

where to start?