Atifeh
Sun 20 January 2008, 05:58
Hello Gerald and all,
Based upon the works done by Gerald, JR, Gmessler and others I came up with a design which I would like to share the concept for further improvements/redesign. A zipped MDT6 file and some screen captures are attached for further discussion. The dwg file will be updated as its progress.
Most of the design, you are familiar with. Some differences are:
An outrigger is devised, 3.5 mm off the iron angle curvature and with sufficient distance from the rail's bolt holes, assembled with the related washers and bolts. It should also provide sufficient room for C-clamping. Although the center distance between the outrigger and the rail crown bearing is about 25 mm, it should provide more support to avoid rocking hence vertical pressure could be exerted. The outrigger will be lifted and lowered proportionate to the rail crown bearing since they are both assembled on one cam mechanism. The 180 degrees rotation of the cam handle will result in 3 mm of displacement. The rail is assumed to be cut from 70x70x7 mm angle iron for a size of 70x30x7 mm.
The inner rolls are KR32 needle bearing which are used as belt idlers (they are quite cheap). Its width is 14 mm compared to the 12 mm of 6004 bearing. These rolls are fixed in their location and the clamping will be done by 2 nos of 6004 bearing as per JR's design.
In order to grind both sides of the rail, the angle grinder assembly will be indexed 180 degrees and no special adjustments are required regarding the rolls locations. Correspondingly the handle location will be changed to the opposite side. This would provide a 2 point grip (the handle and the angle grinder itself).
There are some deficiencies in the drawing which will be completed later; so far they are:
The angle grinder neck and fixing bolts are not drawn since they might vary for different makes. I could not get their dxf files through Tracepart or even their own websites and I don't know if they are willing to submit their drawings to us. It would be a good idea to gather a database of different angle grinders as once Gerald started, with their relative flange holes and neck diameters and heights.
The distance between the angle grinder plate and the grinding wheel itself is not actual. Once established, this will change the hole locations on the side braces and the related holes on the side plate.
By using lobe holes different angles could be set for grinding. I found some Russian bearings having 75 degrees grooves which I can send the pictures if you are interested.
Thanks
Nader
Based upon the works done by Gerald, JR, Gmessler and others I came up with a design which I would like to share the concept for further improvements/redesign. A zipped MDT6 file and some screen captures are attached for further discussion. The dwg file will be updated as its progress.
Most of the design, you are familiar with. Some differences are:
An outrigger is devised, 3.5 mm off the iron angle curvature and with sufficient distance from the rail's bolt holes, assembled with the related washers and bolts. It should also provide sufficient room for C-clamping. Although the center distance between the outrigger and the rail crown bearing is about 25 mm, it should provide more support to avoid rocking hence vertical pressure could be exerted. The outrigger will be lifted and lowered proportionate to the rail crown bearing since they are both assembled on one cam mechanism. The 180 degrees rotation of the cam handle will result in 3 mm of displacement. The rail is assumed to be cut from 70x70x7 mm angle iron for a size of 70x30x7 mm.
The inner rolls are KR32 needle bearing which are used as belt idlers (they are quite cheap). Its width is 14 mm compared to the 12 mm of 6004 bearing. These rolls are fixed in their location and the clamping will be done by 2 nos of 6004 bearing as per JR's design.
In order to grind both sides of the rail, the angle grinder assembly will be indexed 180 degrees and no special adjustments are required regarding the rolls locations. Correspondingly the handle location will be changed to the opposite side. This would provide a 2 point grip (the handle and the angle grinder itself).
There are some deficiencies in the drawing which will be completed later; so far they are:
The angle grinder neck and fixing bolts are not drawn since they might vary for different makes. I could not get their dxf files through Tracepart or even their own websites and I don't know if they are willing to submit their drawings to us. It would be a good idea to gather a database of different angle grinders as once Gerald started, with their relative flange holes and neck diameters and heights.
The distance between the angle grinder plate and the grinding wheel itself is not actual. Once established, this will change the hole locations on the side braces and the related holes on the side plate.
By using lobe holes different angles could be set for grinding. I found some Russian bearings having 75 degrees grooves which I can send the pictures if you are interested.
Thanks
Nader