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| Grinding Rest |
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| RussellT:
I've been meaning to make a grinding rest since I bought a grinder but have managed with freehand grinding. I've been spurred into action by noticing the tearing on one flank of a thread I was cutting and decided that the remedy was more accurate tool grinding. I looked at some designs many of which seemed overcomplicated, and most needed resetting to the wheel after adjusting the angle. I thought it might be possible to make one that would stay set to the wheel as you adjusted the angle by making the edge nearest the wheel the centre of rotation for angle adjustment. :scratch: I thought about adding pivots to the side of the rest but realised they would have to stick up above the surface and may get in the way. :scratch: I thought about a curved slot (and even drew it) before I realised that it would tend to pivot about the bolt rather than slide in the slot. :scratch: I thought about half a tube resting on two support rods with a clamping rod inside before I realised that the rods would have to go through the grinding wheel. :scratch: I've finally come up with a design I'm going to try. I don't know if it's original but I've not seen one like it. There may be a good reason for that. :lol: First I drilled two holes in a 2.25" piece of 1" angle and used them as guides to drill another piece of angle and two scraps of the steel I plan to use for the top of the rest. Then I bolted them together, set them up in the lathe and turned them to 2". I filed the edges to match as these are not critical. This was the result. I took a couple more pieces of stock and drilled and tapped some holes. Then came the trial assembly. Here is the progress so far. The square stock and the bolts are configured like a toolmaker's clamp and when slackened the angle slides on the two pins inserted in the upright. It looks like it might work, I can tighten it with my fingers just enough to lock it solid and the angle adjusts OK. The upright is too thin as it tends to bend under the clamping force and I could get the mounting nearer the centre of the top plate without fouling the grinding wheel if I configure the clamping screws to work from the other side. More to follow soon (I hope). :D Russell |
| Fredbare:
Thanks for sharing Russell, I have been looking at making a grinder rest for some time, and this looks like one I could tackle,will be watching with interest. John |
| Rob.Wilson:
keep the photos coming Russell :thumbup: Rob |
| RussellT:
Thanks for your interest John and Rob. :nrocks: I've made a bit more progress. As I suggested in the last instalment I decided to make the upright thicker to reduce bending and move the table mounting toward the centre of the table and I've also been trying to work out how to make a rigid mounting and see if it will foul the machine's existing guards. :scratch: I briefly considered a mounting along the lines of the existing rests but ruled it out as being far two floppy. The experiment shown in the photo convinced me that it was unlikely ever to be firm enough if it was mounted to the grinder - and it was getting over complicated too - so I decided to mount it to the baseboard. I decided to mount it at centre height - I'm not sure whether there's any reason to as the whole point is that the angle can be adjusted. In the photo the rest is level with the top of the nut. The nut is 19mm so it needs to go down 9.5mm. I hunted through the "come in handy" pile for a bit of angle to mount it to the baseboard and chose this one as it already had a hole in the right place for the clamping screw. It won't go rusty either as it's stainless. I cut the angle in half with the angle grinder (obviously what it's for :lol:)and here's the progress so far. Did I mention I was making two? More to follow. Russell |
| Chuck in E. TN:
Great project, Russell. Following closely to see how it comes out. Chuck |
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