[Monkey King]

I assembly mechanical parts already.


I needed 4 month to finish this project.
Now the most scary parts, electronics.

[Teyber12]

beautiful!

[RotarySMP]

Wow. Amazingly ambitious project. Respect.

How are you doing the spindle drive?

[Enraged]

beautiful work!

[fatal-exception]

Looks awesome man! How much does it weigh? What type of tool turret are you planning? Are you going to have a tailstock also?

Paul

[rowbare]

Very nice lathe. It will be interesting to see it making chips.

I have a question. I noticed that the reference edge for the linear rails is a removable strip. Is there a particular reason you did it that way as opposed to simply machining an edge into the casting?

bob

[Monkey King]

Teyber12,
Thanks.

Mark,
Spindle plan to be driven by 3HP motor & inverter, not bought yet.
Still thinking, to use that or AC Servo ( to do threading)

Enraged,
Thanks.

Paul,
Weight about 150kg.
It will be vertical gang lathe without tailstock

Bob,
The reason for reference edge for the linear rails made from removable strip,
I can adjust easily by grinding the hardened steel insert, instead fix cast iron.

[Monkey King]

Good progress, Today I tested already the most scary parts, electronics.
After few times switch back the parts, make some smoke, finally tested already. But not satisfy yet, add some more electronic parts on the pcb.
:banana::banana::banana:

[Monkey King]

Here the PC connection plan.
PP1 = Charge Pump
PP2 = Step(Pulse) X
PP3 = Dir(Sign) X
PP6 = Step(Pulse) Z
PP7 = Dir(Sign) Z
PP10 = Limits
PP14 = Spindle Speed
PP15 = EStop to PC
Pp16 = Spindle CW
PP17 = Spindle CCW
PP18-25 = Ground
:banana::banana::banana:

[will gilmore]

Mark,
Spindle plan to be driven by 3HP motor & inverter, not bought yet.
Still thinking, to use that or AC Servo ( to do threading)

Looking great. I'm sure you know this but you can do threading without a servo controlled spindle by using a sensor to give a spindle index pulse.

[Monkey King]

Yesterday I bought already Toshiba 5HP Inverter and 4HP Motor.
Already tested H21A3 Phototransistor optical interrupter switch for spindle index pulse. Plan to use PP11 input as Index.
:banana::banana::banana:

[jasminder]

Hi Mark,
I use cnc kneemill.

monkey king,
those doors are 70's indian style doors. What is your location. btw wonderful build. Are you getting tool chaters using 15mm lm guides? any sample of a turned part on your lathe?

jasminder singh

[chich2]

Monkey King,
Very Nice work,

Chich

[p38nut]

AWSOME!!!!!:banana::banana::banana::banana::banana :

[Monkey King]

Jasminder singh,
Linear slide by HIWIN 15mm.
Until now not finish yet, last week I buy pulley and found out that that pulley out of balance. So I make myself. It takes time to finish. Be patient.

Chich,
Thanks

p38nut,
Thanks

:banana::banana::banana:

[Monkey King]

Today I tested the spindle.
Until 3000 rpm the spindle is smooth. but reaching 5000rpm, the spindle is hot after 5 minutes, then the spindle getting heavier to spin, even I put many oil already(I made oil input & output hole for each bearing). I think the spindle got thermal expansion(Spindle body made from cast iron, but the spindle itself made by steel).
Still thinking to use water cooling on spindle body or change the plan to 3000 rpm.
Any suggestion?
:banana::banana::banana:

[asuratman]

Why you should go hi rpm for lathe? What motor RPM basically? If you go that hi, maybe use servo motor spindle like the one on cnc lathe.

[jasminder]

Today I tested the spindle.
Until 3000 rpm the spindle is smooth. but reaching 5000rpm, the spindle is hot after 5 minutes, then the spindle getting heavier to spin, even I put many oil already(I made oil input & output hole for each bearing). I think the spindle got thermal expansion(Spindle body made from cast iron, but the spindle itself made by steel).
Still thinking to use water cooling on spindle body or change the plan to 3000 rpm.
Any suggestion?
:banana::banana::banana:

money king,
water cooling is the best way. I just watercooled my 3A stepper drivers that were getting very hot. But after water cooling they run at room temperature.
But the problem you can face with your spindle cooling is" the circulating water will get too hot in couple of hours".
But for a lathe i guess 3000 rpm should be the limit, specially if it is a small lathe. Btw what you want to turn on 5000 rpm? the bearings will be ruined in months?
I guess sticking to the lower rpms is better option for now. in the future if you are not satisfied with the performance you can upgrade to 5000.

Actually, i am just waiting for your lathe to make chips. plz Do it fast. For water cooling, you may need a huge watertank for watercooling or a chiller system if you have couple of letres only of circulating water.
any pics of the spindle? motor?

jasminder singh

[jasminder]

Today I tested the spindle.
Until 3000 rpm the spindle is smooth. but reaching 5000rpm, the spindle is hot after 5 minutes, then the spindle getting heavier to spin, even I put many oil already(I made oil input & output hole for each bearing). I think the spindle got thermal expansion(Spindle body made from cast iron, but the spindle itself made by steel).
Still thinking to use water cooling on spindle body or change the plan to 3000 rpm.
Any suggestion?
:banana::banana::banana:

another news, the bearings you are using are limited to 4500 rpm according to skf.
http://www.skf.com/skf/productcatalo...=3&startnum=10
check it out

[Monkey King]

asuratman,
because I need 5000 rpm to cut material to archive mirror finish.
I bought motor 4 HP 2880 rpm at 50 Hz.

jasminder,
2 month ago I made chiller by using 2HP air conditioner outdoor unit and made a stainless steel water tank to cool down my miling spindle. This what I'm thinking to use on this machine. For the bearing, It live should be long, since max speed is 6000 rpm, and I'm confirm about alignment of the bearing, since I made the spindle body & spindle by 1 time setup grinding.
But I'll make the lathe run first using 3000rpm and I'll upgrade next time.

:banana::banana::banana: