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Member postings for Peter Sansom

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

Thread: Super 7 questions
18/10/2021 12:38:17

I remember reading a number of years ago that Myford changed at least some of the 1/4" bsf cap screws to M6 due to the old Super 7's used 2 sizes of heads, large and small. The large head 1/4" Cap screws became unobtainable and the M6 Cap screw is between the 2 bsf head sizes. The large head we used to attach the carriage to the apron.

I would assume that Myford stopped all 1/4" bsf at that time but not sure when this occured. Check the manual if you have one, else get one.

Peter

Thread: Stanley combination plane
30/08/2021 12:58:30

I have a Stanley No45 plane. It definitely uses 1/4-28 for some of the threads as I had 1 thumb screw missing and the thread was stripped, Found a screw online and used a 1/4-28 Helicoil to repair the thread. There is also a smaller size used but I never checked the actual thread.

Peter

Thread: Backing up computers across a network
23/08/2021 13:27:02

For network backups, you could purchase a NAS (Network Attached Storage). Otherwise backup to a disk attached to another pc, I use a Raspberry Pi with a couple of disks attached.

Thread: Jammed shaft key removal
22/08/2021 12:59:29

As Roy said, use a chisel to lever it out. You could clean the key with a file. The better way is to get a piece of key steel of the correct width and height, available in both metric and imperial. cut to length and finish with a file to fit. teh keyway.

You can also sometimes find a pre-made, but key steel never goes astray and lengths as relatively cheap.

Thread: Which grade of stainless steel
28/06/2021 12:24:30

303 Stainless is free machining version of 304. 304 is great for cryogenics, BOC used to make its cryogenic plants with 304 SS.

316 is better for Salt water corrosion, 321 for heat.

Peter

Thread: Myford Super 7 Motor Pulley
11/06/2021 13:38:54

The early pulleys were aluminium alloy, current ones are cast iron. Not sure where they changed.

If you are not desperate, keep looking. I ran one for years with a piece missing out of the side of the pulley, alloy. Bought a replacement that is iron, but kept the old in the case I ever purchase a 3 phase motor which would be metric and require the pulley to be bored.

Thread: Availability of a T33 & T34 Myford Change Gears?
06/06/2021 11:59:12

RDG periodically have stock. I you contact them they will let you know when they are expecting more.

Peter

Thread: Adept No 1 or Mal-adept?
19/04/2021 11:53:15

Michael

I have one the same as yours, purchased mid 90's, missing the lever mechanism. Has been sitting in pieces for 20 years due to moving house several times and family issues.

On the list to reassemble over the next year.

Peter

Thread: Anyone else having problems printing from Pocketmags this month?
13/04/2021 13:00:46

In which case Pocket Mags would be better to admit the issue is theirs rather than blaming the publishers.

Peter:

Thread: Myford Super 7 spanner sizes
09/04/2021 11:45:03

Just look for Ring Open End spanners from a good brand. A set comprising 2BA and 1/4"BS to 7/16"BS.

The largest 2 Nuts are the Lead Screw Hand wheel nut and the Tail stock nut.

Peter

Thread: Running MS DOS programs on Windows 10
13/03/2021 07:41:38

I would recommend the free VMware client. Install is easy, available for most OS's.

Just install DOS in it, once working make a backup and it is easy if you have issues.

Thread: Machine corrosion protection
30/01/2021 12:45:44

Lanolin spray, you don't have to remove it to use the machine.

Peter

Thread: Disposable Gas Bottles
18/01/2021 12:11:03

I know of a case when the valve was broken off the top of an G size, large, Oxygen bottle. Took off like a rocket. Fortunately no one was injured.

A quick search with google will show LP Gas cylinders repurposed as stoves. The original Ozpigs were converted gas cylinders. Do so with caution if you convert one.

Thread: Nitrogen as an Energy Store ...
14/01/2021 11:59:56

In the late 70's early 80's I worked on a on an Oxygen plant, Air Separation Unit on a steel works. The steel making process use 750t of gaseous oxygen per day and about 300t of gaseous nitrogen. Yes some liquid Oxygen and Nitrogen was produced, stored for when demand could not be met by gas production, or sold to Linde Gas.

Liquid Nitrogen is not free, there is a cost. The bulk of the liquid Oxygen and Nitrogen after being separated products is returned to gas and in this part of the process is used to cool the incoming air. Storing higher levels of liquid causes increased liquification costs.

These plants are installed in which there is a high demand for the gaseous product, Steel works, petrochemical plants etc. Liquid is not the primary product, it is the method of separating the products. Liquid is used for long term storage and for easy transport unless you are in the rocket business.

Thread: Super 7 Lathe Clutch, Countershaft or Pulley Wobble
09/01/2021 11:38:26

The keyway, on the motor shaft and pulley and therefor the key size is dependent on the motor shaft side which is governed by the motor frame size.

For a B56 frame 3/4hp 1440 rpm motor the key is 3/16" x 3/16" on a 5/8" shaft. You can purchase a length of key steel, about 6", or packs of small keys, either work.

Check your motor shaft size and keyway size before ordering. It is most likely imperial, not metric. There used to be a smaller bore pulley available, today they list 5/8" and 16mm. Did you purchase the correct one for your motor? a 5/18" pulley will not go in a 16 mm shaft whereas teh 16mm will be a loose fit on the 5/8" shaft and will use a metric key.

The reason the key is not listed is that Myford did not supply the lathe with a motor. that was the purchasers responsibility.

Peter

Thread: GHT Rear Toolpost 8deg milling cutter
04/01/2021 11:38:46

I made the rear tool post nearly 30 years ago. From memory once I had machined the dovetail the cutter was then filed the cutter before hardening. One good thing at the time was I had access to a heat treatment shop who hardened it in a salt bath.

The cutter worked with light cuts. Saw it in the last 12 months, took a while to remember what the cutter was.

Thread: Super 7 Lathe Clutch, Countershaft or Pulley Wobble
03/01/2021 12:41:49

Check the bearings in the clutch assembly, there are 2 Deep Groove shielded ball bearings (Imperial) RLS 5-ZZ (LJ5/8-ZZ) in the clutch pulley. Replacements are available from Bearing suppliers. I replaced these bearings due to Clutch noise 2 years ago. Remove the circluips and they can be pushed out fairly easily.

Additionally there are 2 Oilit bushes and 1 ball thrust bearing (Imperial series) that the main counter shaft runs in. Can supply the SKF part number fro this bearing tomorrow as I have 1 and the new oilit bushes sitting in a Workbench drawer waiting to be replaced.

Please note there is a spring inside the clutch assembly that care must be taken to disable. Find the instructions, there are videos on youtube.

Peter

Thread: (Early) Myford Super 7 Adjusting Collar
20/11/2020 23:48:46

the Collar thread is 1/2" 26tpi.

Peter

20/11/2020 11:08:53

I will check thread on a cross slide screw in the morning. I have both metric and imperial, so one is also in storage. On Myfords web site you can get the year from the serial number.

As it is a Mk1 clutch yours was built between the start of the S7's and 1958, just prior to mine as it was built just after the clutch change, original headstock with sight glass and later clutch.

Peter

19/11/2020 11:16:54

When you say early S7, how early. I have a 1958 S7, bought a Metric Cross slide screw in the 90's and the original collar worked fine. My understanding was that only the later S7 with Power Crossfeed used a different screw.

Peter

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