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Member postings for sean logie

Here is a list of all the postings sean logie has made in our forums. Click on a thread name to jump to the thread.

Thread: Threading on Colchester triumph 7 1/2
10/10/2019 15:46:22
Posted by Andrew Johnston on 10/10/2019 14:06:23:

+1 on an Ainjest unit.

I've got an imperial unit, on an imperial lathe, and it makes cutting imperial threads a doddle, even into blind holes like these 3/8" BSP glands:

screwcutting_bsp_me.jpg

Once I'd got the DOC sorted it was four passes and about a minute per gland at 260rpm with 4 thou clearance at the back.

Andrew

Hi,Andrew,

What change gears do you run for metric. All I have are the 120T,42T and 36T which don't work for unless I've missed something on setup. Leadscrew is a 4Tpi. Serial No of lathe is 4/46477.

Any help would be appreciated.

Regards

Sean

10/10/2019 11:33:53
Posted by sean logie on 10/10/2019 11:32:28:
Posted by Ian Parkin on 10/10/2019 11:08:30:

You should have a 21 tooth to replace the 42 tooth one

as set you can do the bottom row of threads on the chart ( the coarsest ones)

The big idler in the middle doesn't appear to move vertically only in a left to right arc.

My apologies sir I missed where it can move up and down

10/10/2019 11:32:28
Posted by Ian Parkin on 10/10/2019 11:08:30:

You should have a 21 tooth to replace the 42 tooth one

as set you can do the bottom row of threads on the chart ( the coarsest ones)

The big idler in the middle doesn't appear to move vertically only in a left to right arc.

10/10/2019 11:04:36

img_20191010_104106.jpgBeen trying to cut threads on this old girl for a while, think I'm missing a gear and I'm hoping someone can help me out. Also I need to know the age of the lathe, is this possible from the serial number.

Thanks

Sean

Thread: 1.5 hp dc motor
31/12/2018 11:44:51
Anyways ..... back to the job in hand and on topic ,I'm confused enough without being side tracked by the shocking stories (No pun intended 😉

Sean
31/12/2018 11:34:32

Well turned on the PCB the red light bottom right corner beside the dc output lit up had the pot wired as shown turned the pot and nothing happened, swapped the red and black wires around and still nothing . I'm wondering if the caps are blown .

Sean 20181231_111340.jpg

31/12/2018 10:29:27
I too have had multiple 240v shocks over the years . My father was thrown across his workshop years ago by a poorly earthed 415v welder plug he nearly lost all the strength in his right arm ,never did fully recover from it .

Sean
30/12/2018 20:17:32
Thanks Dave ,been having a few sherbits this evening ,best not try powering up the motor tonight . Appreciate your input .

Sean
30/12/2018 16:39:05
If you don't hear from me you'll know it gone tits up 😂🤣I'm having a beer just now will have a look later on 😉.

Sean
30/12/2018 12:39:00

20181230_122146.jpg20181230_122116.jpg20181230_122124.jpg20181230_122222.jpg20181230_122259.jpg20181230_122316.jpg

Some more photos of the PCB , motor runs really smooth albeit at slow rpm 😁.

 

Sean

Edited By sean logie on 30/12/2018 12:43:31

Edited By sean logie on 30/12/2018 12:54:06

30/12/2018 08:49:18
Posted by XD 351 on 30/12/2018 08:42:21:

Sean , it would appear to me that you have little experience with mains powered electrical or electronic items so i would suggest you leave it alone until you can get some help from someone who does .

Your controller may just be a simple ac to dc converter and pwm controller but i can't work out what the black lead does . The red ones are probably power but can't be sure . You don't know yet if the controller even works and it could be dangerous to power it up .

I would look around on some various sites like ebay or bangood for a pwm controller that can handle the power requirements of the motor and buy one of them .

I'm not going to be using the original speed controller . I have other plans .

Sean

29/12/2018 20:56:52

Now I'm confused (not hard) which is it ? 240vdc or 110vdc . I've been researching YouTube and the net ,and I'm thinking of going the SRC motor controller and bridge rectifier route , but things like 240vdc being more dangerous simply worries me 🤔😐. So can anyone say for definite what this motor is , I'm tempted to throw it back in the skip 😁😂. On a side note , I'm not needing this motor to run full tilt but will it have torque at low rpm say at 100-200 rpm 

 

Sean

Edited By sean logie on 29/12/2018 21:00:31

29/12/2018 19:12:24

There wasn't any display in the middle it was missing ,and as far I could see the circuit board I have was the only one .

Sean

29/12/2018 19:06:31

What would you suggest , I wouldn't know where or what to look for ,more so not knowing what to look for .

Sean

29/12/2018 18:46:46

So I can't use what's in the photos ?

29/12/2018 18:38:13

It's off a treadmill don't know what model . I have the stop start and the speed control switches, I forgot to take the power on switch .

20181229_134155.jpg

20181229_134150.jpg

Edited By sean logie on 29/12/2018 18:40:38

29/12/2018 13:58:54
My wife has the all singing and dancing treadmill in the spare bedroom and hardly uses it .

Sean
29/12/2018 13:21:15

Was at recycle centre today and score a dc motor . The guys there let me strip all the parts I might need . Next is how I'm going to get this thing working ,kinda hoping you guys on here might know 🤔.

20181229_130923.jpg

20181229_130919.jpg

Thread: 3 phase vs single phase
28/12/2018 19:30:58
Posted by Mark Rand on 08/12/2018 23:02:23:

Sean, an important question that no one has asked yet:- What lathe is it?

1/2hp is suitable for a Myford sized lathe, but 3/4 is better for even an ML7 (I speak from experience). A lathe that's sized for a 2hp motor is not going to be happy with larger work or more aggressive cuts if hobbled by a 1/2hp motor.

In terms of power consumption, the losses of a 2hp single phase motor will be greater than those of a 1/2hp single phase motor or 3ph motor + VFD, but the difference is likely to be no more than 25-50W. I.e.. 3/5 of 5/8 of F-all, as one of my colleagues used to say.

The suggestions of getting a plug in power meter are your best bet. They are cheap these days (especially when Aldi or Lidl have got them on sale, but also from a number of online sellers), and can give you a good idea of just what in the house is eating the power.

Before you do anything else though, have you got an immersion heater that someone's turned on? smile o

Hi Mark , the 2hp motor was total overkill . The lathe is 12x24 Fortis (clausing derived). I've now fitted the 1/2hp motor now , I do notice a difference and in future will have to be more patient in my turning ...ie... smaller cuts 🤔. I'll probably look for a 3/4-1hp motor in the future .

08/12/2018 12:05:41
I tried to tell er indoors that the lathe isn't what's chewing the power it's the bloody condenser tumble dryer 😂🤣
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