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Member postings for JohnF

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

Thread: Pratt Burnerd chuck
11/07/2020 19:50:56

Mike try Rotogrip I am pretty sure they do spare sets of jaws, the numbers are from the original production, spare jaws will have a different number but that so you don't mix jaws from different sets. When new the body and jaw numbers are usually the same but spare jaws will differ.


Thread: Hallite washers
11/07/2020 19:45:47

Hallite seems to have disappeared, I needed [wanted] some a short while back but ended up using an alternative from Ebay -- enter Hallite Gasket Material and search you should find something suitable to make your washers from - easy enough to make a couple of one use punches from the scrap box.

My recollection of Hallite is it was a paper based material with graphite impregnated and some form of reinforcement but I don't remember it as wire ? Stand to be corrected of course.


Thread: teknika
10/07/2020 13:29:47

Hi Bren, An interesting machine, looks to be an instrument makers lathe maybe but some dimensions may help, centre height, distance between centres etc. Never heard of them myself but hopefully there will be some answers. Is there anything that shows its country of origin /


Thread: Ultrasonic Cleaner
09/07/2020 09:29:28

Brian, use the keyword search at the top, just put ultrasonic in and there are heaps of posts, the second one down is pertinent to your question.

I’m sure you are already aware there are many specialist cleaning additives available from one of “ours advertisers Machine DRO (no connection other than a happy customer)


Thread: Hello from Norfolk
08/07/2020 22:01:50

Welcome Steven, usually lots of info on here very unusual for no response before now -- this will surely be rectified. Any questions just ask.

Cheers John

Thread: Machining internal thread
26/06/2020 09:47:25

Don't forget to truncate the thread slightly to ensure the crest does not foul in the root of the ram thread, I would suggest around 0.008" on the dia i.e. calculate as above and add the truncation to the bore size calculated.

No need to do this if you were using a modern full form tip but if not full form I would defiantly truncate the crest.


Thread: EN42J heat treatment
25/06/2020 10:01:50

Robin, I have no experience of EN42 but use EN45 & 47 regularly for springs and the carbon content in EN42 is sufficient for “normal” hardening, I would suggest heat to 850 C and quench in oil then temper to desired hardness, for knives I would suggest 280 C but you may have to experiment. This would be far too hard for a spring ! You need to temper to 340/350 C for Springs

Look at **LINK** for some info

There a couple of knife makers close to me, one uses files to produce unique products the other uses tool steel, aka gauge plate. Lots of info on the web if you dig around


Edit spelling & typo errors 

Edited By JohnF on 25/06/2020 10:03:55

Thread: Halifax 524 Headstock
24/06/2020 19:14:22

David D I may be able to help , see your messages


Edited By JohnF on 24/06/2020 19:21:32

Thread: COMPAQ Bore Gauge
23/06/2020 10:34:17

Howard a few photo's may help everyone to understand better and a model number could be useful.


Thread: Digital angle gauges
21/06/2020 23:14:23

I have a Wixey not too bad and they do seem to have a better resolution than some others however one source of annoyance is even when switched off they still have a drain on the battery thus I often find the battery is flay when i need it. I now remove the battery after use.

At a tool show I saw another brand that was rechargeable via a usb cable, looked an even nicer tool than Wixey so purchased one but found the resolution was not so good -- company concerned very good and offered a replacement or refund.

Check the resolution before purchase and make sure it within your expectations.


Thread: 2020 Stevenson Trophy Competition
19/06/2020 17:42:43

I reckon this needs another bump !

Thread: Hello from across the pond
13/06/2020 17:14:05

Damien -- see your messages -- small black icon Inbox on the red bar John

Thread: Drilling very long holes
13/06/2020 14:19:53
Posted by JohnF on 13/06/2020 12:22:26:

Windy does it have to be EN25T ? if not consider seamless hydraulic tubing easily available in various bore and wall thickness sizes. I have use this material to extend honing tools up to 35" long.


Edited By JohnF on 13/06/2020 12:32:30

Just had a look at what I used and it was 5/8" OD 5/16" bore so you would need to look whats available and if it suits you.

13/06/2020 12:22:26

Windy does it have to be EN25T ? if not consider seamless hydraulic tubing easily available in various bore and wall thickness sizes. I have use this material to extend honing tools up to 35" long.


Edited By JohnF on 13/06/2020 12:32:30

Thread: A curious thermometer
13/06/2020 12:12:01

Plenty of these around in the 1950's, my Dad used them in his greenhouses and they were also used in still air incubators and I remember seeing this use in the late 60's. I believe they were just a general purpose item available in most general stores or ironmongers.


Thread: Damp proofing floor
07/06/2020 21:49:12

Another possibility here but again not cheap **LINK** however may be better to look at the long term advantages !


Thread: Femi Hem Saw 782XL
07/06/2020 08:32:49
Posted by Dave Halford on 06/06/2020 21:02:19:
Posted by JohnF on 06/06/2020 18:24:32:

You can also get Euro/UK converter plugs see here **LINK**


Not at 900W

Quite correct Dave I should have looked closer but it was the first I saw when I looked for an example—- should have paid more attention! I have a couple of items with such adaptors but they are earthed and 13amp fused


06/06/2020 18:24:32

You can also get Euro/UK converter plugs see here **LINK**


Thread: North West UK Newbie
06/06/2020 11:26:01

Welcome Mick lots of info herein just ask ! Where in the NW are you ?


Thread: rescuing a chuck
06/06/2020 11:22:16

Niall exactly right, grind off the tooth on jaw 2 and the remains of the one on jaw 4 also make sure there is no remnants of the broken off jaws on 1 & 3 it should then work OK but as you are aware with reduced capacity.

No looked but try Rotagrip for spare jaws.


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