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Member postings for Bob Brown 1

Here is a list of all the postings Bob Brown 1 has made in our forums. Click on a thread name to jump to the thread.

Thread: Another lathe question
09/10/2020 23:47:27

Sound insulation is not the same as the fluffy stuff you stick in your loft, see **LINK**

Thread: Moving a Myford VMC advice needed thanks!
05/10/2020 09:56:24

When we moved house, I left the machinery moves to the moving companies experts. The machines were loaded onto a pallet and strapped to the pallet, then moved by pallet truck to a Luton style van with a tail lift, the van had tiedowns internally as it was a used for this sort of work. Easy loading/unloading but took an engine crane which I hired for £25.00 to place in the final position, so much easier when you have the kit, gone are the days I'm prepared to struggle with heavy objects.

Thread: Motor power
04/10/2020 01:20:37

He was trying to convince me running a three phase motor wired in delta via a 230v VDF would only give half the power and didn't even understand P = √3 × pf × I × V saying √3 is not used in three phase power calculations and he did boast he was chartered engineer come electrician. There's me just a marine engineer ( big ships) who know nothing, delete is a wonderful thing as I left him talking to himself

03/10/2020 15:58:50

That is what I thought but had what has turned out to be an idiot on Facebook saying the power is halved but was using power=V x I rather than P = √3 × pf × I × V. I think I should have realised when the √3 was questioned.

Thread: Overview of fitting variable frequency drive (VFD) to a Myford ML7
03/10/2020 13:19:14
Posted by Henry Brown on 21/07/2020 11:53:59:

Not wishing to be involved in any of the above shenanigans here is my inverter installation. I was guided by Peter at Inverter Supermarket and a friend who was the works electrician where I used to work in the choice of mounting and the enclosure.

inverter 3.jpg

Hope this is of interest...

The enclosure sits just above my lathe and is spaced 25mm from the wall. There are rearward facing louvers at the top and bottom with some fine mesh to stop most particles that can get that way. When I took these pictures today it obviously works as there is only the merest hint of dust in there.

inverter 2.jpg

Not that different to my setup other than mine has shielded cables and a filter

dscf0076.jpg

 

dscf0078.jpg

Edited By Bob Brown 1 on 03/10/2020 13:19:49

Thread: Motor power
03/10/2020 12:41:48

Does a VFD mean the power of a motor is reduced e.g. 3/4 hp motor running 415v three phase v same motor wired delta 220v three phase from a VFD?

Thread: Boxford AUD motor drive wheel plus reverse switch issue
30/05/2020 22:03:19

This might be useful link

29/05/2020 20:39:14

Taking the motor out may be the best way to solve the key issue.

There are variations in the switch gear and a picture of just what you have may be useful.

As for an inverter not sure that would be worth the expense as you'd need to change the motor as well.

My AUD has been faultless for a number of years and it has done a fair bit of work.

Thread: 3 phase cable for a VFD
17/05/2020 21:49:11

I used SY cable and also have a RF filter on mine all fitted in a cabinet

dscf0078.jpg

Thread: DRO Flashing
24/04/2020 10:38:22

Or the new battery is past it's best.

Thread: Central heating woes.
20/04/2020 14:27:29
Posted by Dave Halford on 20/04/2020 14:14:03:

Diverter valves are a known leak issue

 

As I found out when it tripped the RCBO on the boiler feed with water in the motor.

 

Edited By Bob Brown 1 on 20/04/2020 14:28:00

20/04/2020 09:51:25

Rad sealer will not work where parts move like diverter valves.

20/04/2020 09:35:41

I'd be inclined to investigate just where the leak is, it could be something like the diverter valve if it's a combi boiler.

Once the location of the leak is identified and the faulty part found, you should be able to order the part online. Then get a few tools out and replace it having drained down the boiler first.

There are many videos on line that show how to replace parts so not that difficult to do and before there is the outcry of gas safe, it's not a gas issue just water side.

parts

 

Edited By Bob Brown 1 on 20/04/2020 09:37:19

Thread: Boxford C Lathe
18/04/2020 22:24:12

If you look at the two pictures I posted it shows the gears set in either direction, as I have a AUD the forward and reverse probably gets used more for saddle or cross feeds rather than cutting threads. Feed options are not available on a CUD.

Why would you want too reverse the lead screw unless you were cutting a LH thread?

I usually just quickley wind the tool out (noting the depth of cut) and stop the lathe, then depending on the length of thread either, leaving the lead screw engaged, wind back by hand or carefully reverse the machine taking noting that the chuck is screwed on.

18/04/2020 20:00:37

know your lathe link

18/04/2020 16:12:31

If we are talking about reversing the lead screw then the reversing system is quite simple.

The double gear drive on the lever pivot about the shaft that shows two gears, there are three positions fwd, neutral and reverse. In its current position the headstock shaft drives through the left gear and then to the right and down the gear train. In the opposite direction the left hand gear becomes redundant and drive is direct from the right hand gear.

img_0394.jpg

img_0396.jpg

 

Edited By Bob Brown 1 on 18/04/2020 16:16:59

Thread: Soft jaws
06/04/2020 17:50:04

How many here use soft jaws to hold parts in a lathe?

I've used them in to machine multiple parts as it means there is repeatability.

Thread: Holding End Mill on small lathe
14/03/2020 19:20:11

Some mini lathes do not have a full depth morse taper in the headstock but if yours has I'd opt for a MT1 ER 25 as the range of collets is larger than ER 16. My Boxford has an ER40 on a back plate but it is a bigger lathe.image00002.jpg

Thread: New lathe
10/03/2020 19:08:32

Ask away, owning a 5" AUD for quite a few years I know it fairly well.

09/03/2020 15:35:05

I have a late 5" metric AUD so my answer would be go with the Boxford.

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