FuxGrind

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Kvalitetsfrågor

5 Sep , 2013  

Hantering av kvalitetsbrister.
I några av artiklarna här på liebruk har frågan om kvalitén på de svenska liebladen diskuterats. Speciellt då med tanke på att de tillverkas utanför Sverige. Detta faktum försvårar för användare att få sina erfarenheter av liebladen överförda till det producerande företaget för eventuell anpassning av produktionsmetoder eller design. Årets liar från Schröckenfux(FUX) har föranlett mig att ta kontakt med FUX för att diskutera två problem.

Här nedan har jag kopierat in det första epostmedelandet  till FUX. Även om nu inte FUX finner anledning att bry sig om mina problem och synpunkter kan de kasnske ändå vara till någon nytta för liebruks läsare.

Hello Silvia

Here is my concerns around issues on Ljungdahl scythes.

Firstly this is about the way I do the grinding of the Ljungdahlen scythe and what it implies for Fux preparation, the grinding, of the same scythe.

On the site Liebruk.se there is a small Swedish paper on the way I grind the Scythe. This way of grinding is an adjustment to scythes produced in steel only, not steel embedded in iron.

This grinding tecnik has its certain advantages, firstly the ground(down)side can be finished with less grinding, at best case with no grinding what so ever.

The right(upper)side is grinded using the back(klingenrücken(German)) as support, witch makes the grinding a lot easier.

The FUX grinding of the ground side is as I see it a problem because it forces me to grind more then necessary. In the attached image fuxgrind.png the grinding made by Fux, and as I regard as unnecessary, is pointed to with black arrow. With a scythe with fine surface on the ground side no grinding is needed if no pre grinding by Fux is done

Is it possibly for Fux to make my proposal a try?

 

 My second question is more complicated and from my view is just some observations I think can be of value for improving the Ljungdahl scythe, if confirmed by your own studies. In the second image attached, LjungdahlsBurr.png, my black arrow is pointing at something shining on the very edge of the scythe. When moving the nail from back to edge my nail will stop at this ”burr” because of the resistance it make. The ”burr” is not created by the Wheatstone or sharpening steel, it is a sort of deformation from some minutes of moving. I have recently g rinded four scythes and with some differences, all four confirms my observations.LjungdahlsBurr

As the edge of the grinded Ljungdahs scythe is ticker then my peened Fux scythes, my conclusion is that the Ljungahls scythe is not hard enough. And if its hardness is increased its ability to hold sharpness should also increase. I have never made this observation when using peened scythes. There is thou one unknown property and that is if there is any differences in the scythes materials, that maybe can trough some new light on this question.

I hope my observation will be of some value for the interest of the mowing society.

Best regards

Evert Larsson

 {jcomments on}


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