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Member postings for Brian Oldford

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

Thread: Gandalf is broken
22/10/2019 21:00:48

G26 two part resin.

Thread: Stepper power for autofeed on lathe
20/10/2019 19:52:21
Posted by Phil Grant on 20/10/2019 09:58:34:

Another go for the images.

All the images are good for me now. PCB looks good. What is the power rating of the resistors you have used?

20/10/2019 19:50:18
Posted by Tony Pratt 1 on 20/10/2019 12:21:57:

. . . . . . the Nema24 stepper rated at 4 Nm is only giving 2.3 Nm so slightly underpowered, the supplier refunded the money & let me keep the motor.

.. . . . .

Tony

Could you increase the torque by gearing down the motor?

Thread: 3D parts printing undersize
18/10/2019 18:28:51

This is something pattern-makers have been doing for eons.

Thread: Help with gearbox oil
14/10/2019 21:20:52

**LINK**

Thread: Mystery rotating V block
14/10/2019 21:19:18

ICBW but the base looks not dissimilar to that of a Myford 2 way Vertical Slide.

Thread: Would you buy one of these collets?
12/10/2019 17:20:47

I thought many people had migrated to the ER series of collets nowadays. Obviously not. The grip of an ER collet is parallel over a wide range.

Thread: Tracy Tools Free replacement die.
10/10/2019 15:49:37
Posted by not done it yet on 10/10/2019 13:54:58:

Very good service. They are likely aware (they are now) of the limitations of that batch of carbon steel dies, but good of them to supply a higher quality die as a replacement. I’m sure you are a happy customer as a one day delay in the job is not important. They did not make much (read that as ‘any’ smiley) profit on that sale, but have a) retained a customer and b) will have gained with the positive publicity on the forum.

I'll second that.

Thread: Triangular Screws
07/10/2019 21:03:43
Posted by Neil Wyatt on 07/10/2019 20:51:09:

Well, all new to me, but interesting stuff.

If I get lobulation, I shall probably visit the doctor for advice.

Neil

I'm advised you can get tablets for that.

Thread: Collet sticking in chuck
03/10/2019 10:50:42

Are you actually "locking" the collet into the nut before you're inserting the work-piece? The nut should draw the collet out of the body when you unwind the nut.

Thread: Universal Joint Alignment
02/10/2019 16:47:36
Posted by Howard Lewis on 02/10/2019 15:42:11:

For my birthday, our daughter gave me several years of Model Engineer, dating from 1944 to 1950.

In the 26th December 1946 issue there is an item on universal joints. In the text it refers to fact that for the output to match the input, in terms of instantaneous speed, the forks on the ends of the intermediate shaft should be in line, so that the speed variations introduced by one joint will be cancelled out by the other. This is on the basis that the angle of the joint at each end of the shaft is the same.

Figure 5 illustrates this arrangement.

Howard .

Can we see Figure 5 please.

Thread: BR Standard 9F valve identifcition
30/09/2019 20:14:24

Front and rear dampers

Thread: Stepper power for autofeed on lathe
30/09/2019 15:46:52
Posted by Phil Grant on 30/09/2019 13:06:28:

I did my own PCBs as they are very cheap to get made in China and I don't want the hassle of doing surface mount, the boards will probably be cheaper than just the postage to cover the boards from the states.

I used a 2.8Nm NMEA23 stepper mounted direct to the leadscrew on my mini WARCO lathe and although I've not done any threads yet is works fine as a power feed driven from an Arduino.

How many did you have made? What sort of price were they?

30/09/2019 12:43:32
Posted by Phil Grant on 29/09/2019 11:16:36:

Just an update on my powered feed project, I came across this video on Youtube

I bought the TI LaunchPad board and designed my own, through hole, PCB for the interface and am just waiting for the PCBs to arrive.

Edited By Phil Grant on 29/09/2019 11:17:19

That's the system I'm currently in the process of fitting to my S7. I doing the mechanicals at present.

I'm hoping a **LINK** driving through a pair of 1:1 skew gears will be sufficiently powerful.

In his latest video James says his interface boards will be available fairly soon. I'm waiting to see what the price is before deciding to buy one from him or to do what you've done by rolling your own.

Thread: Inverter Voltages
26/09/2019 20:36:40

How are you planning to get the three phase? I'd be inclined to run it as a delta wired motor with the more commonly available (and thus cheaper) VFD.

Thread: Electronic water gauge
23/09/2019 13:09:51

Ralph Bacon may have published exactly what you want on Youtube just a few days ago. **LINK**

Thread: Surely it's not just me
23/09/2019 13:04:28

What size hex would be needed?

Thread: Shell Petrol Can Puzzle
22/09/2019 19:22:32
Posted by 34046 on 22/09/2019 10:22:42:

Worth keeping and sympathetically restoring.

Collectable item from the 1930's known as a Shell Duo.

There is one on ebay at £695 with plenty of detailed pics of the oil can

Bill

Edited By 34046 on 22/09/2019 10:23:03

There's many items for sale on E-bay at what seems silly prices to some people. Will that petrol can sell at that price?

Thread: Brown & Sharpe 2L surface grinder - drive gear teeth pitch?
20/09/2019 21:21:04
Posted by Adam Harris on 20/09/2019 20:56:09:

Thanks Brian, that looks like just the way to go. I'd obviously like to do things as cheap as possible but while repairing is cheaper and probably easier (when taking modification-to-fit into account) , I think the rapid oscillation to and fro of the table might be a bit too violent for braze recuts or imperfect forms of grub screw recuts. I did read somewhere of special nickel/silicon weld rods being very good for cast iron repairs but not sure about that and actually not sure what type of iron/steel my rack and gears are made of...

Unless very specialised heat treatments are carried out welding CI invariably leads to the formation of brittle carbides at the edges of the welded area. CI repairs should be done with nothing hotter than brazing techniques. See **LINK** and part 2.

 

Edited By Brian Oldford on 20/09/2019 21:21:22

20/09/2019 19:23:52

**LINK**

**LINK**

What more could you ask for?

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