Here is a list of all the postings John P has made in our forums. Click on a thread name to jump to the thread.
Thread: Tens Machine |
02/08/2022 09:42:51 |
Look at this and it will give an indication of how these things work. https://www.learningelectronics.net/circuits/transcutaneous-electrical-nerve_03.html John |
Thread: Warco Dividing-Head: 50 Divisions Possible? |
19/07/2022 12:04:18 |
With this set up as shown the index pin arm is rotated clockwise and |
Thread: Looking for an experienced machinist / toolmaker in Leeds |
17/07/2022 10:10:38 |
In the absence of 1 to 1 tuition there are plenty of videos on this subject Here are some to watch that may be of use.
https://www.youtube.com/watch?v=iMHksf17oqE https://www.youtube.com/watch?v=OwPCHbAOqw8 https://www.youtube.com/watch?v=7tN_uGHNknM https://www.youtube.com/watch?v=CXXfez5I_0A John |
Thread: Cutting copper? |
14/07/2022 14:32:07 |
https://www.lenoxtools.com/Guides/LENOX_20Guide_20to_20Band_20Sawing.pdf
John |
Thread: Where to buy small quantities of 316 steel 60mm (2 3/8 inch) diameter |
08/07/2022 10:49:10 |
Try metal 4u https://www.metals4u.co.uk/materials/stainless-steel/stainless-steel-round/1254-p 60 mm dia 316 x 120 mm long £ 54.35 + post John |
Thread: Home made jet engine |
05/07/2022 15:35:50 |
About the only non-Chinese source is Jetmax, as you say, but taxes and shipping There are cast turbine wheels advertised on Alibaba and other Chinese sites In any case, I thought that was too much money to sink into a project for me If you just want a jet engine, the answer is to buy one! :D There is a GTBA project engine coming to fruition that uses a radial inflow turbine ------------------------------------------------------------------------------------
I used to be a member of the GTBA but let it lapse when they went on line only I seem to remember that before the availability of cast turbine wheels That is why that i said it would be a better option to buy a ready made wheel With that in mind the home made compressor wheel milled from the solid Seeing the last part that you had written about the GTBA radial inflow project The last photo here shows the much modified Shreckling FD 3/64 engine John |
Thread: Casting Advice (no laughing please) |
02/07/2022 20:08:54 |
Posted by Steve355 02/07/2022 09:54:21 Morning Is there anyone out there who has advice for a total beginner at sand casting? I made a waste oil burner and furnace, after a lot of tinkering it’s working pretty well and can My first project is to make some brass sanding blocks for making woodwork moulding planes. I made a pattern on a 3d printer. I used play sand (fine and consistent) and about 10% fireclay I used a cast iron flask, packed down the pattern in the sand vertically and removed it carefully. of course I can sand out some of the pitting, but that’s not the point. Does anyone with experience have any tips? See pics. Yes it’s terrible, I know.
Steve I started casting around 1984 ,i was at a Model engineer show and one of the stands That was about as much as i knew about casting,back then there was no internet and I phoned around some local foundry's and they were most helpful ,bring some buckets My first castings were done using an old tin oil drum full of coke and an old cylinder Eventually i got fed up with the tin can and coke furnace and built this modified Dave The thing is when you have done some of this you tend to forget how much equipment
I don't do much foundry work the last time was about 15 years ago but in the next week
John
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Thread: Home made jet engine |
02/07/2022 17:26:35 |
They use the same gas container as the early Shreckling engines ,the most thrust obtained from the engine that i made was about 6 lb ,i think the GR 180 in the plans above produces about 36 lb. --------------------- https://www.turbomaster.info/eng/applications/compressor.php shows the sizes of nearly all made compressor wheels and is a ----------------------------------- ------------------------------------ --------------------------------------- It is perhaps not worth making a turbine wheel from solid these days
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Thread: See Through Jet Engine |
30/06/2022 17:11:45 |
Watching this makes me want to build one just for the sound alone ! --------------------------------------------------------------- Some useful download plans can be seen here from Gerald Rutten (zip files) Photo here of some Wren MW 54 parts and some KJ 66 parts. New compressor wheels can be found on Aliexpress for less than £20 Standard 608 bearings can be used and are good to about 120,000 rpm John
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Thread: Four Index Thread Indicator |
21/06/2022 13:59:29 |
Just as an update on threading indicators see this on lathes uk http://www.lathes.co.uk/universal-thread-dial-indicator/index.html
John |
Thread: Bearings or bushed |
31/05/2022 20:41:02 |
Aliexpress sell full ceramic bearings for somewhere around £4 each depending on size some will work up to 800 C only at low rpm (200) there are hundreds of them , type in " ball bearings high temperature" to scan through,not able to put reference on here as it will be taken down. John |
Thread: Model Turbines |
23/05/2022 09:48:34 |
Michael This looks about the same size as the one in the springer link .
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23/05/2022 09:22:29 |
This may be of some interest for making a high speed machine spindle. https://link.springer.com/article/10.1007/s40684-019-00105-5#Fig7 John |
Thread: mini grinders |
20/05/2022 11:39:26 |
Posted by ega 20/05/2022 10:59:48 John P: Is that a Quorn spindle in your photo? ---------------------------------- No, it is 1 of 3 spindles made for this machine as internal John |
19/05/2022 20:47:06 |
Posted by William Chitham 19/05/2022 18:55:52 Never used one but a pencil type air powered die grinder might be an option, Jupiter Micro Die Grinder William. -------------------------------------------------- |
Thread: Re-boring Grind Wheels |
15/05/2022 10:26:37 |
Posted by Mark Rand 15/05/2022 09:39:49 I'll leave people to their apprehensions and assume that none of them have ----------------------------------------------------------------------------------- How very true ,bring up any of these grinding type of threads and you see John |
Thread: Minimum depth of cut possible with carbide tooling on S7 |
13/05/2022 14:38:47 |
Posted by Andrew Johnston 13/05/2022 14:07:26 Best to sit down and put on the seat belt before looking at prices for CBN inserts. Andrew
John |
Thread: Re-boring Grind Wheels |
13/05/2022 13:27:03 |
Buying a reputable make or from professional suppliers is no guarantee of getting a good John |
13/05/2022 09:17:18 |
In this video Dan Gelbart shows at about 5 minutes 45 some reworking
For those of us who don't have such facilities China is your friend |
Thread: Adding a leadscrew to a lathe ? |
09/05/2022 14:51:02 |
Posted by Rich2502 09/05/2022 14:15:41
There are now motor controlled set ups withh off the shelf ballscrews that require Is this a practical project or a rabbit hole ? ------------------------------------------------------------
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