#2 MAHO SK250
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Buying

Dit is de tweede Maho sk250.Hij stond bij een machinehandellaar in de buurt.

Hij had en betere tafel, voedings mechanisme, en een betere aandrijflijn.

 

Specifications

 

Machiene: MAHO Universal-Werkzeug-u.Gesenkfrasmaschine. SK250

Fabrikant: Prazisionsmechanik u. Maschinenbau Mayr, Hormann u. Cie., K.G. Pfronten-Steinach/Allgau

Machienenummer: 1553

Max. freesdiam : De snijsnelheidstabel loopt tot 90 mm diam

 

X-travel 380 mm (360 mm op de schaal)
Y travel 180 mm
Z travel knee 300 mm
Spindle 70 mm

Motor:
1400 rpm 2,0 kW
700 rpm 1,2 kW

V-belt motor: Optibelt VB SC plus
type: B1440 Ld/17x1400 L1 B55

verticale spindel snelheid:
1400,1060,800,710, 600,530,450,
400,335,300, 250,224,190,170,125,95

horizontal spindle speeds:
1000,750,500,375,560,425,315,236,
180,132,280,212,160,118,90,67

Inspection

The powerfeed on the table has a lack of momentum. It can be stopped with one hand. To engage it the speedregulatingwheel has to be turned to the extreme left. So it seems that the variable speedcontrol is not in a good order.

There are steel pullies instead of aluminium pullies at the #1.

Details
Final beltsection. It's a double belt with a belt tensioner pully near the top. Between the pullies there is a connection-spanningshaft. The system pivots around the little shaft just at the right side of the low pully. In this way the topslide can move backward and forward along the Y-axis with a constant belt-tension. Controllevers for the X-axis and Z-axis powerfeed.
This is the wheel to control the speed of the powerfeed. The on-off lever is missing at the right side. It's a continuous variable speed control. This is the gearbox that drives the powerfeed.