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Did you locate another motor yet ?
I ask because I have a spare original motor from a Denford machine, not sure it is the same as you need though.
It runs very quitely and is smooth, 180v PMDC

Triac

Hi Steve

Thanks for your reply.
I should have added "using the original programming method", the threaading cycle G33 doesn't give provision to thread from the chuck to tailstock,
also no G95 available to just do a cylic program.

I wanted to use the Orac for this job but will have to run it on my ...

Hi All

Anyone been able to cut left hand threads on an Orac cnc ?

Marcus

Hi
Could you please post some pics of the wiring and connection you finally ended up with to get all working OK ?

Bit late but connect as is, power supply from VFD 1 leg to each set of linked terminals.
If direction is wrong interchange any 2 lines.

I am still using an Orac by writing the program using the original DOS software, I would like to be able to print the programs written for reference in the workshop.
There is a PRINT option in the program but I am unable to get it to work, anyone have an idea to try ?

Marcus

Think you asked this question over on the iO Groups Denford Orac group, turned out to be faulty diode/s on the 24v PSU to the VFD, they were short cct so causing the blown fuse, glad to say it's now up and running.

Triac

I would add it is always a good idea to blow the chips away so the cutter doesn't have to cut them again, also a lubricant will help as it prevents build up on the cutter flute/s which if that happens it will leave a very poor finish. Flood coolant does both jobs but is not possible on all machines ...

Which board do you need as I have some to sell off. ?
Triac

Hi Rob

My Orac is using an original VFD and will take the spindle to 2500, the previous owner must have adjusted the pots to allow
the VFD to go higher than the original settings which state spindle speed of 2000 rpm.

Marcus

Have you done the conversion already and used the original steppers and motor ?
If so do you have details of the work done ?

Thanks, triac

It's an electronic trip and should reset when the Em stop is activated.

Something I had previously was metal chips got into the machine light switch and shorted connections,
this prevented the axis operating in any way. Martin advised the cure for my problem.
Just pull the cover off and check all ...

When viewing the lathe from the back the motor control board is positioned on the extreme right side of the plate.

Marcus

Andy, re the X limit switch, read the last para in my last reply (remove the 2 screws holding the cross slide top cover to view
the X limit)

When you turn the machine power switch on you should hear a contactor close, control circuits are switched ON/OFF by the relay so if not closing you will have ...

Hi Andy, make sure the EM stop is reset otherwise nothing will work, check you are in Manual mode and hold in the override switch on the underside, holding the switch in use the axis buttons to move the carriage off the limit switch/es.
To move off the limits move the Z towards tailstock, move X ...

Thanks for the info Steve, will pass on the details.

Emgee

Help please.

Using the original DOS editing program on an Orac how can I tell the tool turret to rotate within a program ?

Marcus

Colin

Old Machine Software ZIP file, open ORAC file and if DOS will work in your system or with DOSBOX downloaded you will be able to write programs and download to and receive programs from the lathe. Works for me in WinXP OK.

[attachment=0]OLD_MACHINE_SOFTWARE.zip[/attachment]

This file was ...

Hi David

So you are only using Linux for file transfer and storage, not compiling programs in Linux to use with the Orac. ?

Emgee

Hi David

Interested to know if your Orac is still in standard form as this is the first time i've heard of anyone claiming Linux or Mach control of the standard machine.
Are you sure your Orac hasn't been converted before you aquired it ?

Emgee