Search found 17 matches

by johnechall
Sat 28 Jan , 2017 2:16 am
Forum: Orac
Topic: Orac Mach3 Z stuttering when attempting to thread cut
Replies: 3
Views: 835

Re: Orac Mach3 Z stuttering when attempting to thread cut

Problem solved, G97!
Thanks for your help angel tech, greatly appreciated.
by johnechall
Wed 25 Jan , 2017 13:08 pm
Forum: Orac
Topic: Orac Mach3 Z stuttering when attempting to thread cut
Replies: 3
Views: 835

Re: Orac Mach3 Z stuttering when attempting to thread cut

Thread cutting operates fine if I turn off "Use Spindle Feedback In Sync Mode",
but obviously the pitch will be ropey.
Just waiting to try another desktop to see if that solves the problem.
by johnechall
Sat 21 Jan , 2017 15:23 pm
Forum: Orac
Topic: Orac Mach3 Z stuttering when attempting to thread cut
Replies: 3
Views: 835

Orac Mach3 Z stuttering when attempting to thread cut

Hi all, My Orac on Mach3 has developed a problem when attempting to thread cut. It has done plenty before, but now the Z axis stutters along, then comes out in X, but doesn't return to the Z start posn, it tries to take the next pass from the end of the last one. I've cleaned the optical readers and...
by johnechall
Mon 12 May , 2014 10:12 am
Forum: Other CAD CAM and CNC
Topic: Software for Engraving on a sphere
Replies: 1
Views: 4854

Software for Engraving on a sphere

Hi all, Could anybody point me in the right direction. I need to be able to engrave on the radius of a Gear Shift Knob. I have a Triac using Mach3. I turned the knob on my Orac and engraved on a flat surface ok, but would like to try engraving on a spherical surface. I have downloaded Cambam but don...
by johnechall
Fri 26 Apr , 2013 14:44 pm
Forum: Denford Classifieds
Topic: Wanted CD20 stepper drive for Orac lathe.
Replies: 0
Views: 1339

Wanted CD20 stepper drive for Orac lathe.

Tel: 07710498267
by johnechall
Thu 28 Feb , 2013 21:26 pm
Forum: Denford Classifieds
Topic: Triac Wanted
Replies: 0
Views: 1512

Triac Wanted

Triac wanted, contact 07710498267
by johnechall
Thu 21 Jun , 2012 16:54 pm
Forum: Orac
Topic: ORAC UPGRADE
Replies: 10
Views: 2815

ORAC UPGRADE

I have a 1983 orac I am thinking of upgrading to Mach 3. The only fault it has is I am unable to alter the the spindle speed, which is down to the PC1690 board. Are there any kits available? Any advice on converting to Mach 3, would be welcomed. Or if anybody knows if someone could do this for me. I...
by johnechall
Tue 12 Jun , 2012 15:24 pm
Forum: Denford Classifieds
Topic: ORAC 1983 PC 1690 BOARD WANTED
Replies: 0
Views: 1211

ORAC 1983 PC 1690 BOARD WANTED

Hi,
I have a spindle speed probem and have found that the PC 1690 board has a failed chip, Ferranti ZN435J 8216.
Does anybodyknow where I can get one or a spare PC 1690 board?

Regards
John
by johnechall
Tue 12 Jun , 2012 15:22 pm
Forum: Electronics
Topic: ORAC 1983 PC 1690 BOARD
Replies: 0
Views: 1109

ORAC 1983 PC 1690 BOARD

Hi,
I have a spindle speed probem and have found that the PC 1690 board has a failed chip, Ferranti ZN435J 8216.
Does anybodyknow where I can get one or a spare PC 1690 board?

Regards
John
by johnechall
Tue 12 Jun , 2012 15:21 pm
Forum: Orac
Topic: PC 1690 BOARD
Replies: 0
Views: 890

PC 1690 BOARD

Hi,
I have a spindle speed probem and have found that the PC 1690 board has a failed chip, Ferranti ZN435J 8216.
Does anybodyknow where I can get one or a spare PC 1690 board?

Regards
John
by johnechall
Tue 12 Jun , 2012 15:18 pm
Forum: Orac
Topic: Electronic drawings - 1983. Spindle at constant speed.
Replies: 3
Views: 1176

Re: Electronic drawings - 1983. Spindle at constant speed.

Hi,
I have tried reset buttons, but to no avail. I have had the PC1690 board checked out and the Ferranti ZN435J 8216 chip is failing, getting hot. I will try and source one of these or hopefully find a spare PC1690 board.

Regards
John
by johnechall
Wed 06 Jun , 2012 11:03 am
Forum: Orac
Topic: Electronic drawings - 1983. Spindle at constant speed.
Replies: 3
Views: 1176

Re: Electronic drawings - 1983. Spindle at constant speed.

I have measured the voltage at pins 17 and 18 on the PC1690 board and it is 5.2V. When the
-ve button is pressed to reduce the speed the voltage drops to approx 1.2V.
So am I right in thinking the 10V Zener is ok. If so, what do I need to check on the VFD.

Regards

John
by johnechall
Mon 04 Jun , 2012 14:20 pm
Forum: Orac
Topic: Electronic drawings - 1983. Spindle at constant speed.
Replies: 3
Views: 1176

Electronic drawings - 1983. Spindle at constant speed.

Hi, Does anybody have any electrical drawings for a 1983 orac. I am trying to get my spindle working properly. It is running at a constant speed and I am unable to change manually or in program. I have tried both reset buttons. I can run programs, but spindle speed does not change. The bleeper works...
by johnechall
Sun 03 Jun , 2012 22:21 pm
Forum: Orac
Topic: Orac 1983 unable to change Spindle Speed
Replies: 4
Views: 1171

Re: Orac 1983 unable to change Spindle Speed

Yes, everything seems ok. I have ran a program, but spindle speed cannot be changed.
by johnechall
Sun 03 Jun , 2012 21:49 pm
Forum: Orac
Topic: Orac 1983 unable to change Spindle Speed
Replies: 4
Views: 1171

Re: Orac 1983 unable to change Spindle Speed

Hello Rob,

Thank you for responding.
No it doesn't change within the program.
It did work fine until I triggered the limit switch on the x axis.

Regards
John
by johnechall
Sun 03 Jun , 2012 12:49 pm
Forum: Orac
Topic: Orac 1983 unable to change Spindle Speed
Replies: 4
Views: 1171

Orac 1983 unable to change Spindle Speed

Hello All, I have a 1983 Orac with a spindle speed problem.
When I start the spindle it reaches a constant speed and I am unable to change the speed
using the -ve and +ve buttons. The bleeper is working but no change in speed.

Hope somebody may be able to help.
by johnechall
Thu 31 May , 2012 15:54 pm
Forum: Denford Classifieds
Topic: Denford Orac 1983, Automatic tool changer wanted.
Replies: 3
Views: 2058

Denford Orac 1983, Automatic tool changer wanted.

Hi all, I have just bought an 1983 Orac in great cond and totally standard.
I have written a few progs on xp laptop using the old dos software with no problems. I could now really do with an ATC or even a quick change tool post with holders, as this has the single clamp.
Cheers
John