Emco PC120 Turn

[magicniner]

Thanks.Odd, if it has a 'backwards grip' Id think it likely.

The smaller diameter range non-reversible jaw set on self centring chucks still have steps on the outside for gripping the inside of cylindrical work, it's more common on smaller chucks that just one reversible set is supplied.

A quick and easy way to check is that the teeth which engage the scroll will have symmetrical inner and outer faces if the jaws are reversible,

- Nick

[Chaz]

The smaller diameter range non-reversible jaw set on self centring chucks still have steps on the outside for gripping the inside of cylindrical work, it's more common on smaller chucks that just one reversible set is supplied.

A quick and easy way to check is that the teeth which engage the scroll will have symmetrical inner and outer faces if the jaws are reversible,

- Nick

Thanks. I dont think this one is reversible. Pity, I need around 100mm and only have 85 or so.

ATC works. Got an idea how to do offsets but not sure how you 'centre' a drill.

The spindle is being given controls via RS485. It doesnt work on power up. Enable the plugin for the VFD, it works but trips (kicks out reset on software). Then disable the VFD plugin, it works without a problem. That said, it spins the wrong way initially then the correct way. The speed inputs also dont seem to work well. Might need to reset this setup and start again.

Any thoughts?

[m_c]

ATC works. Got an idea how to do offsets but not sure how you 'centre' a drill.

DTI, jog buttons, then use the tool setup page to set the measured X dimension to zero and update the tool offsets.

The spindle is being given controls via RS485. It doesnt work on power up. Enable the plugin for the VFD, it works but trips (kicks out reset on software). Then disable the VFD plugin, it works without a problem. That said, it spins the wrong way initially then the correct way. The speed inputs also dont seem to work well. Might need to reset this setup and start again.

Any thoughts?

Modbus is the most consistent way to set spindle speed, however it sounds like there may be a bug or two in the scripting. Probably best to post over on the mach forum, as I've never used Modbus directly with Mach.

[Chaz]

DTI, jog buttons, then use the tool setup page to set the measured X dimension to zero and update the tool offsets.

Modbus is the most consistent way to set spindle speed, however it sounds like there may be a bug or two in the scripting. Probably best to post over on the mach forum, as I've never used Modbus directly with Mach.

Thanks. Not sure I understand about how to centre the drill but I need to play around more. I understand offsets and how tools will vary. If you have a set size in the chuck (lets say 20mm rod), then you use the edge as the reference. Suppose I could do the drill the same way.

I understand too that Z is set when you face a part, so this is fairly easy. What I'm not sure about yet is when / how do you set your X to Zero (assuming master tool is in the turret)?

Also, there is wiring coming from what I believe to be a spindle pulse generator. Then another set of wires going elsewhere with a part missing in between. I assume this could be some form of 'interface'. Without accurate spindle counts I cannot thread, is this correct? Any other major drawbacks?

[m_c]

Thanks. Not sure I understand about how to centre the drill but I need to play around more. I understand offsets and how tools will vary. If you have a set size in the chuck (lets say 20mm rod), then you use the edge as the reference. Suppose I could do the drill the same way.

I understand too that Z is set when you face a part, so this is fairly easy. What I'm not sure about yet is when / how do you set your X to Zero (assuming master tool is in the turret)?

You have to use a dial gauge to get the drill on centre in the X-axis movement. Stick the dial gauge to the chuck, then spin the chuck/dial gauge around the shank of the drill/holder, and jog the X axis until the drill is on centre. If the drill is at the wrong height, then there's an alignment issue with the turret.

If you have accurate homing, then you don't need a master tool. All the offsets are simply taken from the home position.
The master tool process is only needed if you're homing the machine manually, so you can take a test cut with the master tool, then enter that value to manually set the machine position, then have all subsequent tool offsets set from the master tool.

Also, there is wiring coming from what I believe to be a spindle pulse generator. Then another set of wires going elsewhere with a part missing in between. I assume this could be some form of 'interface'. Without accurate spindle counts I cannot thread, is this correct? Any other major drawbacks?

If the machine is running Mach3 via the parallel port, then to thread you need a single pulse. Originally there would likely of been some form of multiline sensor on the spindle, but it's of no use to the parallel port.

[Chaz]

You have to use a dial gauge to get the drill on centre in the X-axis movement. Stick the dial gauge to the chuck, then spin the chuck/dial gauge around the shank of the drill/holder, and jog the X axis until the drill is on centre. If the drill is at the wrong height, then there's an alignment issue with the turret.

If you have accurate homing, then you don't need a master tool. All the offsets are simply taken from the home position.
The master tool process is only needed if you're homing the machine manually, so you can take a test cut with the master tool, then enter that value to manually set the machine position, then have all subsequent tool offsets set from the master tool.


If the machine is running Mach3 via the parallel port, then to thread you need a single pulse. Originally there would likely of been some form of multiline sensor on the spindle, but it's of no use to the parallel port.

Thanks. I tried to put on a dial gauge last night but space is an issue. I need a smaller setup.

In terms of home position, I am hoping that with electrical proximity switches, this will be fairly accurate. I will do some tests later.

On the sensor for the spindle, I noted what I recall to be 3 wires coming out from the sensor. Let's assume this is a single pulse (or needs to be converted somehow), is there normally an input into the BOB or similar to read these? If the sensor is damaged, is there a part that can be bought that will give me what I need (like a generic generator that works with most setups)?

Many thanks for your help / info, been very useful.

[Chaz]

Also, The tool max length I can use is around 68mm long. Any longer and it catches on the Z axis coverplate. The manual indicates that 12mm tools are max size and on centre. Thing is, they are all too long. Is it common to cut them shorter? Even boring bars are typically too long and as they cannot protrude out the back, need to be shortened?

I also need to work out the CW and CCW. For normal turning, the lathe spins 'backwards' as the turret feeds from the top but for drilling you need to spin different direction. How / where would you set this?

[magicniner]

Is it common to cut them shorter?

Yes, just lop off the spare, the manufacturer would originally have sold you some (very expensive) tools made for the machine but whatever works is good,

- Nick

[m_c]

Yes, just lop off the spare, the manufacturer would originally have sold you some (very expensive) tools made for the machine but whatever works is good

There's something un-nerving yet satisfying about taking the angle grinder with a cutting disk to new tools. I think the most expensive thing I've chopped so far is a carbide shanked boring bar. Definitely a case of measure twice cut once!

[Chaz]

There's something un-nerving yet satisfying about taking the angle grinder with a cutting disk to new tools. I think the most expensive thing I've chopped so far is a carbide shanked boring bar. Definitely a case of measure twice cut once!

Ye, I agree. Certainly ...