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Member postings for Peter Turvey

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

Thread: Only for Myford lathes
04/02/2020 23:49:03

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Bought my September 1966 Super 7B back in January 1990 from a friend for 60% of new price. It was little used, my friend bought it from a deceased friend’s estate virtually new and it then sat in a heated workshop as a spare until I was offered it it when my friend downsized. Apart from cleaning and adjustment have only replaced felt wipers, the drive belt and back gear bull wheel spring. Also bought quite a few more accessories for it. Lathe is used occasionally for Edwardian car and various steam engine repair and maintenance jobs. No real reason to replace/upgrade at the moment

 

Edited By Peter Turvey on 04/02/2020 23:57:56

Edited By Peter Turvey on 04/02/2020 23:58:54

Edited By Peter Turvey on 04/02/2020 23:59:41

Thread: Poor finish using indexable lathe tools on steel
23/04/2019 18:56:28

Achieving much better finish now on 3" diameter EN1A bar, speed upped to 1000 rpm, depth of cut 0.020, feed 0.004 per revolution. Facing cuts at same speed and depth of cut, by hand feed (no power cross feed).

So thanks again for assistance. Stanley steamer front wheel bearing cup driver nearly finished, car will be on the road again very soon!

This all started when I took the front wheels off her to regrease them the other week, found a bearing had been damaged by water getting into it, and had to start making a bearing cup driver and a new dust seal plate.

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Edited By Peter Turvey on 23/04/2019 18:57:39

16/04/2019 18:01:23

XD 351 was right, tip chipped off by the time I took the facing cuts.

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16/04/2019 16:40:25

Again, many thanks for the loads of helpful and informative comments, had not expected such a quick and extensive response. Making an action list for the next bit of turning to be done. Will check the insert tips again too. they are 0.2mm radius.

Will be a few days before I can get in the workshop again though.

15/04/2019 22:01:01

Thanks for the quick feedback everyone, will give your suggestions a try when I can get in the workshop again later this week.

I got my initial ideas on speeds and feeds from the Greenwood website cutting data page by the way.

15/04/2019 20:52:04

Any advice regarding cause of poor finish when turning EN1A Freecutting steel using indexable carbide tooling?

Using standard Greenwood type 1 general purpose inserts in a Myford Super 7B. 10mm shank in Dickson toolpost

Cutting dry

Turning 3" max diameter EN1A steel bar down to about 2 1/8" diameter

Speed 290 RPM

Feed 0.0069" per revolution seems to be getting best finish

Cut depth between 5 and 10 thou (deeper cuts at higher feeds causing jams and belt slips)

Checked all gibs are tight but not over tight.

Chips coming off anything between long blued spirals and fine particles depending on cut and feed rates.

Getting better finish on facing cuts

(Component will be a part of a bearing cone puller for our 1914 Stanley Steam Car, so not a need for high finish - but a useful turning exercise)

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Thread: Myford black washers
09/04/2019 18:25:22

Thanks for your advice everyone, I may follow Jeff's advice and turn one up in the end, workshop time is limited at the moment so looked for off the shelf option first.

05/04/2019 10:45:23

Anyone know where I can get 1/4" bore Myford style thick black washers?

Thread: Myford Dickson toolholder and 10mm tooling
19/02/2019 17:45:16

Thanks Roderick and Chris query resolved.

Edited By Peter Turvey on 19/02/2019 17:45:46

18/02/2019 19:41:00

Thanks for your comments everyone, curious about this as my Toolmex holders,  and two Piddington toolholders bought from Myfords at the same time as the standard ones do not have this issue, taking a 10mm indexable tool with about 10 thou clearance under the toolholder.

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Edited By Peter Turvey on 18/02/2019 19:45:07

18/02/2019 15:52:51

Just bought a couple of standard Dickson toolholders from Myford Ltd, these will not lower enough to take my 10mm indexable lathe tools due to the tool slot base thickness. Could this be due to the age of my Super 7B, September 1966, do the the later S7 lathes with different saddle and slides suffer from this?

Thread: 1/2 bore slitting saw suppliers
22/01/2019 22:58:23

Anyone know where I can get 1/2” bore slitting saws to suit my Myford between centres abour? Warco are out of stock, looking for 1/16” or less thickness and about 3” diameter for a one off job.

Thread: RDG or Myford ER32 collet set?
12/01/2019 09:49:53

Thank you for your comments everybody ; in the end I bought a RDG Myford collet set and backplate fitting chuck. I checked out Vertex suppliers but found that the collets alone were nearly twice the price of the RDG set. Not justified for my very occasional use. The RDG set is giving a runout of between 0.0005" and 0.001" seemingly depending on collet size, The taper in the collet chuck seems to be is running with about 0.0003" runout, I see from other threads that the collets themselves should have a .0005" accuracy.

Some of this may be due the backplate itself having a small runout as it does not seem as snug a fit on the spindle nose as my chucks.

Thread: Endfloat Myford Super 7 and thrust bearing condition
11/01/2019 14:56:52

I am resetting the spindle thrust bearings on my 1966 Super 7 to remove endfloat, following instructions in the lathe manual. Readjustment has taken the preloading adjustment collar on the spindle end about1/4 turn beyond the scribed original setting mark on the spindle. Endfloat is about 1/4 thousandths of an inch or less now. Given the age of the lathe, is this amount of wear in the thrust bearings acceptable, or should they be replaced? Have a rather heavy driling job to do soon, 3/4 inch hole in a 2 inch long phosphor bronze bearing blank hence all this adjustment.

Thread: RDG or Myford ER32 collet set?
07/01/2019 12:52:44

Thanks, here are links to the RDG site

https://www.rdgtools.co.uk/acatalog/ER32-COLLET-CHUCK-MYFORD-THREAD-WITH-FULL-COLLET-SET--2PC-SET--4353445.html

Funnily enough, I can not find the small bore collet chuck and collet set on the Myford site now. My Ipad shows it but the PC does not! Think it may be picking up an old cached version of the Myford website.

All is now explained, thanks all for your feedback.

06/01/2019 22:41:36
Posted by John Haine on 06/01/2019 22:17:07:

Now I'm confused. RDG I think own Myford. So is there a difference?

You can get ER32 chucks that have a taper, such as MT2 or MT3 or R8 and fit into a taper socket typically for holding milling cutters. Not very good on a lathe for workholding because (a) you can't pass material through into the h/s bore and (b) because of the overhang.

Much better on the lathe as emgee has said is the type that fits on to a backplate that screws on to the spindle nose. This minimises the overhang and lets material pass through. Depending on your lathe either ER32 or 40. My S7 is the big bore type and I went for ER40 from Myford before they went bust. I tend to use it more that 3J or 4J chucks.

John thanks for your comments, Both sets have backplate fitting chucks, hence my confusion.....is the price difference just rhe Myford name I wonder?

06/01/2019 20:12:27

Whats the difference between the RDG and Myford ER32 2-20 mm 18 piece collet and collet chuck sets? Apart from some £30 in price they look very similar. The former is described on the website as Myfiord thread and the latter for small bore Myfords like mine. So not sure which one to get.

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