Metalwork - Projects - Adjustable Spanner
This is a handy little tool but it is difficult to make well. It can be used both as an Adjustable Spanner, as intended, and as a workholding device.
Cutting out the 'slot' in the body is time consuming. Use a Ø7mm drill in the wider sections and a Ø5mm drill in the narrow sections. Then using a junior hacksaw cut between the drilled holes. This will remove the majority of the material. Accuracy is needed when drilling, especially in the narrow sections.
Here, the Adjustable Jaw is manufactured from one piece of steel. You would really need to use a 4 Jaw Chuck to create the M6 screw section. Trying to file this is impractical, (although not impossible). As an alternative it could be manufactured from two pieces of steel by making the block section and the screw section from two pieces of steel. Drill and tap M5, the centre of the block section side. On the lathe, turn down the unthreaded end of the screw section and thread M5. Screw the two pieces together and braze so that they won't come apart. (Note : Consider if you will heat treat this piece before brazing.)
The plans makes use of 2 Holding Plates. These are there to stop the Adjustable Jaw from falling out of the body. Only one is required if you are not going to be turning the Adjustable Spanner over. The screws holding the Holding Plates to the Adjustable Jaw are 6.5mm in length to ensure the Holding Plates are not tight against the body, thus restricting movement.
You may want to consider Heat Treating the tool parts after manufacture to improve it's life expectancy. Unless you make it from a higher carbon content steel than the suggested mild steel, you're only real option is to Case Harden the parts. I will be making a page about Heat Treatment of Steel soon and will provide a link here when it's done.
Download All : Solidworks Part, Solidworks Drawing, PDF of Drawing. 3D images.
# Archive : AdjustableSpanner.zip ThumbScrew.SLDPRT 3DImages 3DImages\1.gif 3DImages\2.gif 3DImages\3.gif 3DImages\4.gif 3DImages\5.gif 3DImages\6.gif 3DImages\7.gif 3DImages\8.gif 3DImages\9.gif Drawings Drawings\AdjustableJaw.pdf Drawings\AdjustableJaw.SLDDRW Drawings\Body.pdf Drawings\Body.SLDDRW Drawings\HoldingPlate.pdf Drawings\HoldingPlate.SLDDRW Drawings\ThumbScrew.pdf Drawings\ThumbScrew.SLDDRW AdjustableJaw.SLDPRT Assem1.SLDASM Body.SLDPRT HoldingPlate.SLDPRT M3x6_5pan.sldprt # Files 25 #