Thread: Holbrook C10 Lathe

Hi Ewan,

Not exactly sure what motor/VSD you are using but why not use the three motor speeds?

Stuart

p.s. nvm I see now...... I'm working on something like that ATM. I think it can be made to work though slower than factory. depends how much trouble you want to go to.

Originally Posted by Michael G

But hasn't everyone's lathe got one of those? (Mine has)

Michael

Hi Michael,
everytime I go out and look at my lathe now, it seems so inadequate lol.

Phil

Originally Posted by Steamwhisperer

Hi Michael,
everytime I go out and look at my lathe now, it seems so inadequate lol.

Phil

Never mind, you just go and pat the nice Colchester you've got at work and appreciate the quality of a real machine....

PDW

Originally Posted by Steamwhisperer

Everytime I go out and look at my lathe now, it seems so inadequate lol.

Hmm. I see your problem. Here are some pictures. Perhaps you could print one out, tape it over your tailstock and pretend...

P1020266 (Large).JPG P1020263 (Large).JPG P1020264 (Large).JPG

Michael
(sorry - couldn't resist)

Originally Posted by Ueee

I'm hoping i can catch up with Ray and see what his suggestions are.

Hi Ew, The trip up your way is next week, probably Tuesday.... I have a circuit board that has provision for a tacho that I'll bring up and you can see if it will work on the lathe.

I started on this a few years back and it got shelved for other projects, but seems like a good time to roll it out... I like 270 degree analog displays for tacho's



The lcd and the 4 pots on the upper right are for a ( yet to completed ) feed and speed calculator, that eventually would feed the speed reference to the vfd..

Ray

Hi Ray,
when you eventually finish the calculator part of it and the control for the VFD, can you consider coding for a lathe option? One that would allow entering a starting and finishing diameter and vary the spindle speed to maintain the set surface speed? I'm not quite sure how you could feed in the current diameter along the way, mind you, but I can't imagine that to be a big hurdle for you
Maybe an input from the DRO scale?

On my lathe - with soon-to-be fitted stepper drive to the y-axis (as well as lead screw), the controller might tell your processor where the cutting tool is.....
Now that would be something really interesting!

Originally Posted by Michael G

Hmm. I see your problem. Here are some pictures. Perhaps you could print one out, tape it over your tailstock and pretend...

P1020266 (Large).JPG P1020263 (Large).JPG P1020264 (Large).JPG

Michael
(sorry - couldn't resist)

You call that a dab? THIS is a dab! I hope that little thing doesn't make your lathe feel inadequate.....

I made up a 1/2" tapered mandrel today so i could true up the T/S handwheel bush and fit it to another handwheel i happened to have.

DSCN2237 (Large).jpgDSCN2238 (Large).jpgDSCN2242 (Large).jpg

I also took a few cuts on some some unknown 40mm bar as well, not a bad finish from a standard CCMT insert.....

DSCN2222 (Large).jpg

Thanks for digging that out Ray, sure looks interesting.

Ew

Originally Posted by jhovel

Hi Ray,
when you eventually finish the calculator part of it and the control for the VFD, can you consider coding for a lathe option? One that would allow entering a starting and finishing diameter and vary the spindle speed to maintain the set surface speed? I'm not quite sure how you could feed in the current diameter along the way, mind you, but I can't imagine that to be a big hurdle for you
Maybe an input from the DRO scale?

On my lathe - with soon-to-be fitted stepper drive to the y-axis (as well as lead screw), the controller might tell your processor where the cutting tool is.....
Now that would be something really interesting!

Hi Joe,

That pcb was designed to be part of the cnc conversion, the vfd reference switching is auto-off-manual.. in the manual position the vfd reference comes from the pot, while in the auto position the vfd reference comes from an external source, so a seperate processor could be used to change the spindle speed with diameter. At some point in that upgrade process, it becomes a cnc conversion..

Ray

PS... Ewan, do you want me to bring some hi-rake CC inserts?

Originally Posted by RayG

PS... Ewan, do you want me to bring some hi-rake CC inserts?

That would be much appreciated. I was tossing up whether to get some or some cermets. It would be nice to try a CCGT just to see how they go. There are far to many insert choices out there, the ones i have are Iscar CCMT09T04-14 http://www.iscar.com/eCatalog/Family...pp=20&GFSTYP=M

Ew

Originally Posted by Michael G

Hmm. I see your problem. Here are some pictures. Perhaps you could print one out, tape it over your tailstock and pretend...

P1020266 (Large).JPG P1020263 (Large).JPG P1020264 (Large).JPG

Michael
(sorry - couldn't resist)

Originally Posted by Ueee

You call that a dab? THIS is a dab! I hope that little thing doesn't make your lathe feel inadequate.....

Couldn't resist! pffft, you guys couldn't wait.
I may just have to go out to the shed today and drill a hole in my tailstock then machine up a dab and never use it.

Phil

Nice one Ueee

welcome to the holbrook club

cheers
Harty

Thanks Harty. Seems like a nice little club to be in

I spent the day re-wiring the switch board with new Telemecanique contactors. The main power contactor had already been replaced (that was the crooked one Eskimo pointed out) and the insulation on the coil was gone on the coolant one. The fwd/rev ones were ok, if a bit noisy but i figured since i had some new ones i may as well use them. The problem with the old coils is they double as the transformer for the display lights. Not something that is an off the shelf part unfortunately.....

Anyone after getting the board out i pulled off what i didn't need, re wired what i needed to and added some DIN rail for mounting the contactors on. After testing I put it back in tonight and it all works except the coolant pump is running all the time. I *think* i know why but i ran out of time his evening.

I am just waiting on an interlock to arrive, and i have left the old thermal overload unit in as i don't have a new one.

Damn its easy when you have a wiring diagram...(sorry Stu)

Ew

Originally Posted by Ueee

Thanks Harty. Seems like a nice little club to be in

I spent the day re-wiring the switch board with new Telemecanique contactors. The main power contactor had already been replaced (that was the crooked one Eskimo pointed out) and the insulation on the coil was gone on the coolant one. The fwd/rev ones were ok, if a bit noisy but i figured since i had some new ones i may as well use them. The problem with the old coils is they double as the transformer for the display lights. Not something that is an off the shelf part unfortunately.....

Anyone after getting the board out i pulled off what i didn't need, re wired what i needed to and added some DIN rail for mounting the contactors on. After testing I put it back in tonight and it all works except the coolant pump is running all the time. I *think* i know why but i ran out of time his evening.

I am just waiting on an interlock to arrive, and i have left the old thermal overload unit in as i don't have a new one.

Damn its easy when you have a wiring diagram...(sorry Stu)

Ew

you done a good job there Ewan , with all one color wiring like that is hard to work with even for electrician
Peter

Originally Posted by Michael G

One of the worst faults is that you can't get a 5 cent piece to fall over when taking a cut (I think that's about 500rpm).


Attachment 313575

How are you going to use it to shake the bubbles out of two pack mixes if it doesn't vibrate?

I just couldn't resist.....
DSCN2324 (Large).jpg
2000 RPM .010" DOC. Actually the hardest part was finding a 5c piece that would stand on its edge full stop. Presumably once they have been in circulation for a while the edges get knocked around and start to round over.

The problem with the coolant pump wiring was as i thought and it is working as it should now. Now i just need to get the coolant plumbing sorted and make some adjustable feet and level her. Mind you just sitting on the floor she is cutting a taper of only .004mm over 100mm.

Ew