EMCO Maximat Standard cross slide scraping and testng
Автор: Jan Sverre Haugjord
Загружено: 23 нояб. 2018 г.
Просмотров: 3 962 просмотра
Scraping and testing saddle the usual way and showing parts of this.
As a point of discussion I figured it was OK to show the way EMCO has designed this saddle, ie. using the so called narrow-guide principle so that the saddle is run between the vertical sides on the front shear only. The surface that runs against the rear side of the front shear is divided into 2 separate areas or "pads". They are a bit longer apart than on the Myford, which reflects the fact that the EMCO is a little bigger, being otherwise quite similar. The use of the front shear only for guidance would in my eyes be the same as the use of a V-way (for guidance I mean). The difference is of course the bigger area available for load support when using a flatbed as opposed to a V-bed. In both cases, on small lathes at least it seems that the rear vertical faces do not have any guidance properties (I may be wrong, but as far as I have checked this is the case on most hobby type lathes). The horizontal faces are in both cases used for load support and as the one member of the "clamp" together with the hold down piece that rides the underside of the rear way.
It strikes me that a difference between these methods vs. a separate milling machine is that the table on the latter type is guided between the outer faces / dovetails, while in our case we will have a construction that doesn't allow for the same kind of stability!? For example, if you perform a milling operation and feed in the longitudenal direction, using the saddle / cross-slide table on the EMCO (or Myford, or any small lathe on which the cross-slide doubles as a milling table) you will have a sideways force acting outside of the guiding ways, force being magnified by the ratio between the distance from the point of support (front shear) and where the milling cutter impact vs. the width of the front shear/vertical faces. In simple terms, less sturdy and prone to wear. This also magnified by the relative short width of the contact areas on the saddles.. Maybe one reason why Myford decided to move from narrow- to the wide-guide principle?
I wonder if one simple solution would be to have some pads built into the rear of the saddle, so that when needed, eg. heavy cuts feeding in the longitudenal direction, the outer "wings" of the saddle are better supported..

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