[bluezone]

Getting closer every day.

Found 2 bolts and nuts to hold stop button on. lots of room awy from contacts.




Need to get a nut to go on the knob. Thin nut. Have looked in my bins and havent got one so have to hunt for one. Just got a rubber washer holding it at moment.

[bluezone]

Any ones one know what size the thread on the nut is for the speed control knob? To me it looks like m8 x .75 Having a hard time finding something to fit it.

[john-100]

Hi Bluezone ,

with an unusually fine pitch my first thoughts was it could be an extra fine
metric thread

but having a quick look on the net
I think it it more likely to be an extra fine 5/16 UNF

unless you can find the same nut used on an inexpensive switch or potentiometer in a local shop
it looks like you may have to buy a new one just to get the nut !!

catch 22 being , if you had a working lathe you could make one

John

[bluezone]

Hi Bluezone ,

with an unusually fine pitch my first thoughts was it could be an extra fine
metric thread

but having a quick look on the net
I think it it more likely to be an extra fine 5/16 UNF

unless you can find the same nut used on an inexpensive switch or potentiometer in a local shop
it looks like you may have to buy a new one just to get the nut !!

catch 22 being , if you had a working lathe you could make one

John

Yeh have tryed electronic shops and a pc shop and a couple of the main nuts and bolts shops. No luck. Mite have to buy one of the units just to get nut.

Was thinking of going into a car wreckers and having a look on old car headunits the ones with knobs.

[bluezone]

Right back to the lathe. I still havent wired it up yet but plan is to do it this week Im on holiday for a week. Been to busy working on my other project.




Image of the plugs and parts.

[john-100]

Hi Bluezone

I see you have been busy doing other things

looks like thats giong to be a lot of fun



just one note -- the green (or green/yellow) wire should be connected

the headstock and not the live brown one !!!!

a copy and paste error I expect ?


John

[bluezone]

Will have a look tomorrow. havent hooked any wires up yet. but do remember 2 or 3 of the wires have a eyelit end on the not a plug type end. there is 2 spots on the headstock with earth stickers side them.

[bluezone]

Yip your right. I did it wrong on drawing.

green (or green/yellow)

side of moter to headstock and green (or green/yellow) from mains to headstock.

Thanks. Will take some photos of it all wired up to show you before I start powering it on.

Dont want to have to run out the door after the big explosion that makes to **** my pants.

[john-100]

Hi Bluezone ,

we don't want that , do we

the only other thing to watch is the live supply goes to rear of the fuse holder
just so you don't get a shock removing a good fuse withe the mains on

on my lathe the metal body of the forward / reverse switch is earthed
so the toggle can't become live

if you don't replace the metal screws ,holding the stop switch in place ,
with nylon ones or insulate them inside the box
it may be an idea to earth them to

have tested the board ?

depending how brave you feel
you can connect the mains via a 100W bulb in series with the fuse
with a 10 or 15W bulb inplace of the motor

( the 100W bulb will limit any fault current if there is a problem )

if this works , you can wire it as normal
and test it with the motor

I very often use the series bulb limiter when working on switch mode power supplys when they have gone bang




John

[bluezone]

Thanks for the info.

Ok so i have hooked up most of the wires put got stuck on the A1 and A2 wires from the middle of the switch. 1x gray, 1x black.

Only tabs i can see for them is on the main board A+, A-, F+, F-

Photo of the 2 wires.


Just checked the live supply goes to rear of the fuse holder and is right.

There is no earth wire on the metal part of switch should I install one like this? And is it go up to the headstock?
http://www.cnczone.com/forums/attach...4&d=1302438316

Photos.

[john-100]

Hi Bluezone

its the A+ and A- you want ,they are the controlled armature supply

if the motor runs in the wrong direction just swap them over

if reverse is faster than forward the switch is upside down


the F+ and F- terminal are the unused DC supply to the motor field winding

the motor on our lathes have a permanent magnet instead


on the sieg version of the lathe has 4 earthing points on the headstock
and as in the picture you linked to
the wire earthing the forward /reverse switch is connected to the headstock

it prevents you from shock if a stray live wire in the box ,touched the switch or water based cutting fluid etc got into the switch and made the switch live
since its fastened to a plastic box

John

[bluezone]

Thanks, will hook them 2 wires up in the morning and have made a earth cable for the switch so will install that also.

Not far to go now. have to rember to check if reverse is faster than forward the switch is upside down.

Will update you tomorrow.

[bluezone]

Ok got all hooked up and checked and checked again all wires. Plugged in a safety plug also and turned on the power.

No big bang or smoke. Thank god for that. Tested forward and reverse switch and can hear something clicking over on the electrics board so then I turned the knob and it started moving and very slowly turned speed up to max but it is going slower then a old lady walking down the road.

Here is a video of it running in with switch on forward and then reverse.
[ame=http://www.youtube.com/watch?v=3gBs5g-DER4]Mini Lathe 1st test run - YouTube[/ame]

Any ideas why it going so slow. Have got the right greese on all the parts as book says and can turn the chuck with hand easyly.

Also the bang in the video was a tool falling of the bench lol i just about **** myself as you can see in video i jump.

[Al_The_Man]

Is you MAX pot turned all the way down?
turn it fully clockwise to start with.
Al.

[bluezone]

Just had a look this is how they are set at moment. As I had them when I got the lathe.



What one should I adjust 1st.

Thanks

[bluezone]

Is you MAX pot turned all the way down?
turn it fully clockwise to start with.
Al.

checked it. It was turned on to about 70% after putting it to 100% the lathe spins faster but when I get to just over 1/2 way turning the speed knob the machine starts pulsing on and off.

Any ideas?

[bluezone]

Here is a video of it after putting MAX pot turn to 100%
[ame=http://www.youtube.com/watch?v=C2jznu6obFQ]Mini Lathe 2nd test run - YouTube[/ame]

As you can see its going a lot faster but pulsing.

[john-100]

Hi Bluezone

you may have to reset the accel preset

is in the picture below

John


PS had a problem with an email account and missed the alert to your posting

[bluezone]

Thanks john. Yeh in the photo i attached it looks like the accel pot is on about 15-20% or 80-90%

Will check it all tomorrow.

Seen I have a small problem with the blue cover on the back that covers the moter. 1 of the holes is out about 10mm. Will take photo tomorrow. Could be a easy fix or i may be missing something.

[john-100]

Hi

I think its closer to zero , the pots only turn about 270 degrees

John