I’ll start by a description of the Bedford Saw Elektra Beckum 315 modification and its advantages:
This kit replaces the existing top bearing assembly of two side bearings with two new side bearings. There also a new top-rear bearing where the rear bearing is in the same plane as the bandsaw blade. In my view this is much better than the old top-rear bearing which was located at 90 degrees to the blade. It also replaces the existing bottom assembly of one rear side-acting bearing and two side restraining rubbing strips with a new three bearing bottom bearing assembly, of a similar design to the new top bearing assembly. It is the bottom bearing assembly which is the most important part of the modification, giving vastly improved and more accurate blade guidance. The top bearing assembly is also a good improvement, it is neater and better designed than the original and takes up less space, resulting in a greater available depth of cut – Bedford say 18mm extra cutting depth but I estimate it to be about 25mm. The kit also includes a new aluminium extrusion to carry the top bearing guide assembly, plus all the nuts and bolts needed and a drilling template.
I have a 1998 Elektra Beckum BAS 315 with a cast iron table and here are my comments and tips on fitting the modification kit – bear in mind that the 315 was manufactured over many years and mine might not be exactly the same as every other machine:
After removing the table, the bottom bearing assembly requires a new hole to be drilled in the top of the bottom cabinet and this is located and drilled using the provided template. This works very well but my only comment would be that the positioning of the newly drilled hole means that the bearing supporting rod is extended perhaps a little further than ideal when the assembly is adjusted to fit the blade.
I did not need to drill new table mounting holes for the 4 x M8 Bolts, as the existing holes were correct.
The existing top bearing assembly is removed in two main parts and is held onto the bottom of the aluminium extrusion by two self-tapping screws. I removed the old extrusion by first removing the two self-tapping screws holding the end stop plate – top of the extrusion – and then sliding it out. I found that the new extrusion was only about 0.4 mm wider where it fits between the top cabinet guide rails but this was enough to prevent it from sliding in the guide rails. At this point I was almost resigned to the new extrusion being too wide. The fitting instructions state that it might not fit the 315 and that the old extrusion could be used in this case?
Looking at the old and new extrusions it was apparent that there are two significant differences.:
1. The old extrusion was longer than the new one and this was due to an extra length of blade housing at the bottom. The new extrusion lacks this extra length because it’s not needed with the reduced height of the new bearing assembly.
2. The new extrusion has a milled 15mm slot starting at 5mm above the bottom of the section, that fits between the top cabinet guide rails. The milled slot corresponds to a protruding part on the new bearing assembly which positively locates it when fitted.
From the above differences I first thought that I’d have to either shorten and mill a slot in the old extrusion or mill 0.4 off the width of the new extrusion – not quick or easy in either case. I then had that “Doh” moment! Would the top cabinet guide rails move? The two rails (two lengths of small section angle iron) are held in place with 4 x M6 (10mm spanner) bolts and nuts. Examining the rail mounting holes I could see that they looked slightly oversize, allowing for some movement and adjustment. I moved one of the rails slightly and adjusted for a snug but movable fit for the new extrusion. From then on it was plain sailing and the new top bearing assembly was held in place with a plate in the new extrusion T slot and an M8 nylock nut and bolt.
I concluded that the old extrusion would not work with the new bearing assembly on my machine unless significantly modified, and in my case, I have to disagree that the old extrusion could be used with the new bearing assembly, as stated in the fitting instructions.
When initially setting both sets of bearings, I left the table off for visibility and first adjusted the tracking of the blade with the top cabinet handle. I found the best sequence of adjustment for the bearing assemblies was to first adjust the fore and aft position of the assemblies so that the side bearings located correctly on the blade – just behind the teeth and gullets. I then adjusted the side-to-side adjustment of the side bearings and the fore and aft adjustment of the back bearings.
This is a vast improvement over the old system, giving greater more consistent accuracy together with easier adjustment. Bedford Saw are to be commended for their continued support of Elektra Beckum bandsaw spares and modifications kits. Highly recommended.