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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.

Thread: my knowledge of steel needs improving
20/08/2019 15:48:32

Not only does turning the steel easy to turn in a lathe, it also becomes the choice of the right turning tool for a particular steel with / without alloy and the hardness of steel when we think of cutting angle in the turning tool.
The choice of steel depends on whether the steel is tough, hardened or alloy depends on what you are going to use the steel for, for example, the chassis in the locomotive must be tough to be able to carry the weight or tools must be hardened to withstand wear. When choosing steel, follow the drawing which steel is recommended for it to last a long time in the machine or resist cracking, we choose one that is tough. There is also combined by both parts hard surface against wear and toughness in the steel against cracking as solidified steel is fragile to example in the crankshaft or cam shaft (rare used in own produced model engine due low load/wear).

There are many different codes depending on which supplier produces the closest / same quality steel. In the internet or in the catalog for steel there is listed in a table of various codes corresponding to the steel quality you are looking for.

Thread: Digital calipers made in same factory?
15/08/2019 20:32:17

Compare the CE marking and learn out which of them is real or fake as here.. Real CE vs fake CE..

Thread: Should I begin with mild steel on lathe?
15/08/2019 20:04:16

Hi, not just what material is easy to cut on lathe etc .. I read through the comments, nothing written a word about the cutting angles of lathe tools. The cutting angles are equally important when cutting a particular material with good results.

Read this link..


Thread: A depthing tool and escape wheel
11/06/2019 20:40:31

Michael,.. thanks, there was very well information to check the hole is in same angle with two disc when turn the disc and reverse disc etc.. thumbs up

11/06/2019 10:17:23

I has Vernier on round rotating table, then I can create the dividing disc and attached on the rear spindle on the Boley watchmaker lathe. First I must check the indexing in the indexing head is correct in divisions in the correct angle/distance between each hole on the test disc. I can't be sure it's my fault under operation or fault with divisions in the indexing head.

10/06/2019 11:01:42

Hi folks!

Can i use the deepthing tool to check the escape wheel and anchor to check the deept and tooth on escape wheel is in correct angle when the pallets do not hit one of the teeth?

I maked the new Graham escape wheel who are 18 mm and 25 teeth and learned out the pallets hit 2 teeth in same time, the other teeth is ok. The angle is not correct in the teeth. I used the indexing head to make the escape wheel. Not easy to make the small escape wheel with big indexing head.

I has not 25 teeth in the pulley at Boley watchmaker lathe.

Do you have idea to make precise indexed 25 teeth escape wheel and how to check the angle/division is correct?

Thread: 1950/60 car electronic rev counter
20/11/2018 21:57:40

16000 impulses,.. maybe a motorcycle tachometer? How much are the max revolution in the gauge? In case 4 cylinder 4 stroke engine can i think 16000 impulses divided by 4 (camlope in the distibutor) if the wire is connected to coil will be 4000 rpm in the tachometer.

Thread: L. H. Sparey Running Centre
02/11/2018 20:59:15

The grease nipple part 6 is not strictly necessary since the grease last very well in the rotating centre tool. The treaded hole where you added grease nipple is to hold the rotating center with the bolt while you are turning 60 degree cone on rotating centre who are new without 60 degree cone or turn the new 60 degree cone if the cone is damaged or worn out after a lot of years use.

Edited By Jens Eirik Skogstad on 02/11/2018 20:59:31

02/11/2018 20:51:50
Posted by not done it yet on 02/11/2018 19:33:57:


Metric in this century? I note the mixed units!

Very fine for newbeginner to learn and use both metric and imperial measure tools. wink

Thread: Cox Per Wee or Tee Dee
29/10/2018 21:55:41
Posted by Andrew Tinsley on 29/10/2018 12:39:10:

Do yourself a favour and build something from 1 cc upwards as a first project. If you have never built an IC engine before, trying to replicate the smallest Coxs is a mugs game. You are most unlikely to get a good runner. You would have to use a Cox glowhead too. Small diesel engines need fits every bit as good as Cox engines. A 5 cc Sparey diesel is a good starting point for getting into IC engines.


As usual the model engine with long stoke and large of piston length is not difficult to lap and fit piston/cylinder due there is less leakage than a short stoke engine with short of piston length who can be difficult for a new beginner who are creating the first model engine.

28/10/2018 20:58:35

The Cox engines had cylinder and piston who was cyanid case hardened while the parts of piston who had layer of copper was not hardened. Not possible in a model engineer shop since cyanid case hardening is poison.. frown

Edited By Jens Eirik Skogstad on 28/10/2018 21:05:33

Thread: 1.1 kW electric motor burns up..
30/08/2018 16:40:48

I has installed the new 2 hp/1500 watt electric motor - 2700 rpm with only 1 condenser (The old motor 1,5 hp/1100 watt - 1400 rpm with 2 condenser). It works much better and i do not need set too high gear (pulley and belt) to keep same speed. Also it's less load on the engine for same spindle revolution. Less hot motor house.

The VFD + motor is not cheap for me.. 

Edited By Jens Eirik Skogstad on 30/08/2018 16:42:00

Thread: Cheap chinese Involute gear cutters
30/08/2018 16:29:01

Module 1 is very easy to remember when you are creating the blank gearwheel also if you want to make 50 teeth gearwheel, then add 2 extra to 50 teeth will be 52 mm blank gear wheel (formula: (2+Z) x Module) and height of tooth is 2,25 mm. Module 1 is same as 3,1416 mm (PI) .  

Edited By Jens Eirik Skogstad on 30/08/2018 16:33:32

Thread: 1.1 kW electric motor burns up..
23/08/2018 19:39:33

There is a lot of specifications of inverters, how can i select the right inverter if i select the motor at 1,1 KW 3 phase motor? And is variable revolution better when i want to select the required revolution via inverter?

23/08/2018 18:39:03
Posted by Thor on 23/08/2018 17:55:40:

Hi Jens Erik,

When I upgraded my lathe to 3-phase + VFD I ordered a package from Transwave who advertise on this page. A single phase motor might be a bit cheaper, but I think 3-phase + VFD is worth the price.


Thanks! I must take a look at the homepage and find what they sell the 3 phase and VFD set.

23/08/2018 17:49:31

The spindle move free without hard points, same with other ball bearings in motor and the middle pulley without belt. The belt was not tightened for hard. Suspect that there are problems with centrifugal start switching inside the motor. The motor was new, ran a few hours before the start capacitor died out. Switched to a new start capacitor with the same capacity. The engine has 2 capacitors - start capacitor and running capacitor. And worked well in a few minutes before it ended, as I described in the first message. The condensers were not burned or developed smoke. Smoke came from the motor. A short life motor.

There is nothing wrote about running-in the motor or run the motor in 30 minutes before use, also not all is wrote in instruction created by chinese factory.

I read some of them in commends recommend 3 phase motor + VFD. Will it cost more than a new motor? Better in torque? I am thinking to replace with a 3 phase motor + VFD. Do you have a link?

23/08/2018 06:29:23
It came a lot of smoke from motor, all bearings is moving free without hard points. 1480 rpm geared up to 2050 rpm is too much can i think.
22/08/2018 22:57:13

Hi folks! I has used the milling machine at low speed (belts at low revolution) when i created gearwheel without problem. But the electric motor at 1,1 kW can't last more and burn up when i drilled the hole with 1 mm drill at high speed (belts at the highest revolution at 2050 rpm). Is it common problem with chinese electric motor?

Before i installed the 16 ampere fuse and 2,5 mm2 wiring to tool room where the milling machine is standing there, the 10 ampere fuse burst each time when i set the milling machine at high speed at 2050 rpm then i think the electric motor is too big for 10 ampere quick fuse. But not fact, there is some fault inside the electric motor since the house is hot. I learned out the belt gearing is over geared in high speed also the electric motor speed is lower than spindle speed, a weak engine who can't run the over geared belt with a load from 1 mm drill.

It's a Zhejiang ZX 30L mill/drill machine with belt.

Which electric motor can i replace? Want a reliable electric motor who can last long.

I will not repair the shitty chinese electric motor made by chinese city smith in backyard. This electric motor has taken away my pleasure to use milling machine.

Thread: Size of threads on milling arbor
30/07/2018 09:21:13
I has tried with M10, will not distort the treads.. best to use correct size.
30/07/2018 08:03:21
Thanks a lot! Now i can create a new drawbar with 3/8-16 and i has already 2 drawbar with 12mm and 1/2".
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