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Member postings for Jens Eirik Skogstad

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

<< First < Prev 15 16 17 18 19 20
Thread: Cylinder lubrication
23/02/2010 19:16:42
If you has a lof of cylinder, use steam pipe to admit the cylinder oil. I prefer cylinder oil admitted into the steam pipe to be sure the whole moving parts are lubricated either it is a one cylinder or multi cylinder steam engine.
Thread: Heat Treatment of I/C Cylinders
15/02/2010 20:13:39
Posted by Ramon Wilson on 15/02/2010 00:05:54:

 
 PS Jens, What is the engine in your avatar please?
 
 
The engine are an "Alpha" 0,5 cc diesel engine. This engine has piston made of cast iron from brake disc and the cylinder are made of torsion spring rod from rear suspension in Peugeot 405. The torsion spring rod was annealed before i machined the sleeve and never been hardened after the cylinder was ready to use. The engine has still good compression.
Some are changed in the engine, the crankcase are whole machined of aluminium with bronze bearing  (not in two parts of crankcase and front house who are locktided to crankcase). The crankcase are sandblasted to make tooling marks unvisible. The wristpin are not pressed into the piston, also the wrist pin are prevented to fall out of piston when i drilled the two holes for transfer port and induction port instead the whole rectangle milled ports as in the drawning of  "Alpha" by Richard Gordon. Crankshaft are of torsion spring steel.
 
I maked the engine with a worned and unprecision (much play)  lathe Myford ML10, important: my hands are made to make a precision works with lapping tools and sandpaper to make surface nice.

Edited By Jens Eirik Skogstad on 15/02/2010 20:19:57

14/02/2010 19:25:50
Hi, use high tensile steel, chrome steel or cast iron as sleeve. Not neccesary to harden the cylinder, the high tensile steel are hard enough. If you want to harden the cylinder, then the cylinder need grinding to right size by tool post grinder both outside and inside since the cylinder are oversized by hardening and are not very true after hardening hence tool post grinding are neccesary.
 
I has builded model engines with cylinder made of annealed drive shaft from front wheel drive car, the steel are hard enough against wearing with piston of cast iron.
 
Lap the cylinder a bit tapered. To test the cylinder fit are correct: The piston are loose in BDC and tight a bit before TDC, the piston are running easy in the cylinder with oil and running tight in the cylinder without oil.  
 
When the engine are cold, it will keep compression while the engine are starting by operator and will expand to parallel sleeve when the engine are warm. If the cylinder was parallel, it will lose compression soon when the engine are warm and will lost power and can not run more. Also an unuseful engine with parallel cylinder.

Edited By Jens Eirik Skogstad on 14/02/2010 19:32:57

Edited By Jens Eirik Skogstad on 14/02/2010 19:38:58

Thread: Hexagon holes
07/02/2010 08:28:29
Or go for this rotary broaching as here: http://www.rotarybroaching.net/support.htm 
Thread: Parallel Turning
07/02/2010 07:21:26
Forgotten to write in addition, we have a rule about tolerance to set up and get an acceptable measure when we are making a machine part to example since not all machine tools are accurate to make exact measure every time.
07/02/2010 05:57:01
To make true parallel turning are not so easy at a long bar with lathe only..
 
To make true parallel bar: use emerypaper and micrometer. Important to keep dust away from bed and clean up all dust from bar before measuring the parallelism of bar.
Wait to the bar has cooled down to room temperature (20 C degree before use micrometer).
 
 
Thread: Old lathe, chuck accuracy
30/01/2010 20:27:12
Posted by Mark Smith 3 on 30/01/2010 19:08:01:
 I have yet to learn about collets, do these mount directly in the morse taper? I have been trying to make small parts with just the chuck, that is wrong it seems.
Mark
 
There are the collet chuck with morse taper direct mounted to the spindle, to example ER32 Milling Collet Chuck Sets, see this link: http://www.arceurotrade.co.uk/Catalogue/Collets/ER-Collets-Collet-Chucks/ER32-Collets-Collet-Chucks
 
The collet chuck are true than traditional chuck and are practical if you need to make parts true without adjusting with DTI and 4 jaws chuck. It save much time in working time.

Edited By Jens Eirik Skogstad on 30/01/2010 20:29:51

25/01/2010 05:35:43
Are the centerhole in the backplate worned out? Are there no play between the spindle and backplate?
 
In case make a new backplate or buy a backplate then make it true before the chuck are mounted at backplate without play. Best to use cast iron as material.
 
And in case there are worned out  jaws or chuck, buy a new set  jaws or new chuck.
 
I am using ER32 collet set with ER32 spindle with MK3 taper to fit the spindle, there are allways true than chuck. Above 25 mm diameter i am using chuck.
 
Jens Eirik
Thread: Selecting a size of boiler to a marine steam engine of known size..
26/12/2009 23:52:37
A lot of thanks! There are really cheap books
 
I has a question about the boiler:
 
The time steam boiler will give steam quantity in a time period determined by the amount of water?
 
Vapor pressure is determined by the heating effect provided by the burner or the size of heating surface?
 
Are this correct?
 
 
25/12/2009 19:49:43
Thanks, i am trying to seek after the book "Model Boilers and Boilermaking" and buy/bid if the book are in Ebay.
Thread: Merry Xmas
25/12/2009 19:44:45
Merry Christmas and happy new year!
 
 
Greetings from Norway.
 
Jens Eirik
 
 

Edited By Jens Eirik Skogstad on 25/12/2009 19:47:17

Thread: Selecting a size of boiler to a marine steam engine of known size..
25/12/2009 08:36:08
Hi all folks!
 
I has a twin cylinder double acting steam engine, the bore are 1/2" and stroke 5/8" (12.7 mm x 14.7 mm). Working pressure are 29-44 PSI (2-3 Bar).
 
How can i find the right size of boiler from smallest to biggest in this range adapted for a steam engine where the cylinder volume are known?
 
Are there some calculation to find the size of steam boiler when the cylinder volume are known?
 
Merry Christmas and Happy new year to all folks in forum!
Thread: Solid Alcohol
29/11/2009 09:48:50
Or use Esbit solid fuel tablets, the toy shop who are selling Wilesco steam engine are selling Esbit solid fuel tablets as fuel for Wilesco steam engines. 
Thread: oil
23/11/2009 21:29:40
The oil Shell Tellus T37 are often used as lathe oil. Motoroil are ok as lubricant for lathe.
 
I personally using motoroil 5W-30 to my Sieg 250x500 lathe since i get oil free from car shop where i am working as carmechanic, works well as lubricant for lathe.
 
Important to keep the lathe bed, slides etc cleaned periodical free for swarf, grinding dust etc.. and lubricate before and after work. Use magnetic disc below cutting tool  to catch swarf/dust when working with cast iron because the cast iron dust + oil works well as lapping paste at bed and slides.
 
A messy lathe will not last forever!
Thread: Piston Ring Material
22/11/2009 08:52:35
Posted by Stick on 27/06/2009 18:52:37:
... I hadn't given any thought regarding hard spots in the cored bar, ... 
 
To be honest i has never seen hard spots in cast iron in the used car parts such as in brake disc, cam shaft or flywheel, they are of good quality cast iron.
 
Do not unharden the hardened cam in camshaft!!! You will get hard spots in soft cast iron between cams after the camshaft has been redglowing.. It is impossible to unharden the cams, they will be still hard.
 
 
Thread: Material for piston/cylinder.
22/11/2009 08:42:05
Now i am clearly ,and i has the alternatives to use the material on slow running steam engine:
 
Brass on brass
Brass on bronze
Brass on aluminium
Aluminium on bronze
Stainless steel on bronze
 
For hi-reving steam engine:
 
Cast iron on cast iron
 
 
Yes, all metals will corrode by material combination caused by electrolytic reaction or water moisture, but it will be protected by oil after use, also no water or water moisture inside when the steam engine are stored in a dry place.
 
 

Edited By Jens Eirik Skogstad on 22/11/2009 08:42:53

Thread: Piston Ring Material
21/11/2009 06:47:24
Posted by Stick on 26/06/2009 15:42:11:
.... and have to use solid cast iron bar, of course most of the bar is bored out to swarf and bar is not cheap.
 
 
 You can use cast iron from old cam shaft (not cam, impossible to working with tools) or brake disc from car as piston ring material.
 
I has used the material from cam shaft/brake disc with good results in my model engines.
 
Thread: Material for piston/cylinder.
21/11/2009 06:24:28
Hi Meyrick, i am model engine builder ( http://www.youtube.com/watch?v=wmH6WUMUEJg ), but not enough knowledge about steam engines when i am talking about the material in piston/cylinder.
 
Yes, the Mamod and Wilesco steam engines has brass in brass piston/cylinder.
Some steam engines has brass in bronce or brass in aluminium, which has better friction coefficient? With other word less friction.
Thread: Leaky Safety Valves.
20/11/2009 22:36:31
Valve seat shall have an angle in the opposite direction (not same as the valve seat as we know, are used in the internal combustion engine) and put the ball down on the valve seat and give a light stroke on the ball, it will shape the valve seat of the ball and will be tight against leakage.
 
I used this method and works well after the idea from the book "Model engineer" by Henry Greenly

Edited By Jens Eirik Skogstad on 20/11/2009 22:37:35

Thread: Material for piston/cylinder.
20/11/2009 22:17:39
Hi all folks!
 
I am building the twin oscillating steam engine for steam boat, which material are good to run togheter?
 
Brass on brass, aluminium on brass or brass on bronce?
 
Regards Jens Eirik from Norway
 
 
<< First < Prev 15 16 17 18 19 20
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