High Speed Steel Grinding Jig.

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ieezitin:
Ok!
I did not like the base of the cross slide and if you notice I left a gap on the base in the X direction, this was for to feed in the tool into the side of the wheel, I played with it and just did not like it. I put the thinking cap on and decided to install a stainless plate on the bottom. Here is the result.

Here is the view now with the cross fence base installed. Notice I made a long bolt with a stainless tube butting up to the angle bracket. I did this so when I want to rotate it in the Y axis its long enough just to comfortably grip and twist, I will make a nice handle for it later its working for me know.

So I did not like the cross fence the way it was, the side is plastic and when I was fiddling with it I noticed that the tool steel was scratching and tearing strips off it, so I got some aluminum plate and set about rebuilding the plastic part

As you now can see I beefed up the plastic part. It came out nice and the feel was better, another plus was that the tool steel slipped more smoothly, aluminum is quite a nice bearing surface when polished, I know it will ware quick but replacing it will not be a chore. Going back to feeding the tool bit into the side of the wheel I was playing with it and I noticed that my fingers would come quite close to the wheel if I were to shape small pieces. ! Uh huh! Cant have that so I have decided to make a jig on a jig, here you will see a gear from an old printer, 3/8 stainless all thread and two deep groove ball bearings, I am going to make a rack and pinion type feeder jig.

Itching to play with it a while I set up for a trial run. I am going to grind an end cutting edge of 20 deg at the same time grinding a 6 deg end relief.

Here is the result of the first cut. It took from a blank to get both edges about 12 minuets or exactly one beer. Im happy so far.

Any ideas I am all ears……. Anthony.

ieezitin:
Well.
Its been very cold here and my farm seems to be breaking down a lot which in turn needs fixing so progress on the jig slowed down a little.

But I had a few hours to spare so onward I dug in. I made the hold down plate as shown here, the all thread is ¼-20 and drilled straight through the aluminum plate. I turned up some large diameter brass disks and knurled them, the back pin has a disk with a raised hub to support the force applied from the front pin closest the cutting piece being clamped.

Both threaded rods have springs connected to the disks so both are pushing up, this is so that when I want to change the height of the cutter it raises easy and makes for a nice level lift. Works very well, nice smoother action. The clamp pressure is very tight and I am happy with it. This clamp will work from ¼ square up too 1 inch.

I was playing around with the Y axis and noticed the way I made the ways , it was sticky and was very annoying coupled with it was not true, I tried to counter act this with putting bearings at key points to make things smoother. I just made things worse so I have decided to scrap the base. I am going to go to a metal supplier I use and see if he has some bearings to do this job. I have a lot of 7mm ground drill rod I salvage from discarded printers and I am looking for some ball-bushing type bearings.

I know I started out with a cheap and cheerful attitude to this build, but the more I tinker with this the more I realize I need something accurate, as my intentions are to grind threading tips and do finesse touch ups on dull tooling.

Any ideas I am all ears. Anthony.

tinkerer:
Anthony, you are a skilled fabricator and I have found this to be accurate and stable. I can take detailed pictures and measurements for you if needed, but the concept is pretty clear. The long one on the right side is for wood lathe chisels. The beauty of this is that you can take it form the rough wheel on the left to the fine wheel on the right and not have to check the set up. A small change to the rest will give you movement in all three axis's. If you need more info, just ask.

ieezitin:
Tink.

What most I got from your set up is the fact you can go from the course wheel to fine. :doh:

I like that idea of not changing the angles and such for both wheels..

Your set up and measurements will not help me but thank you for your willingness to furnish me with them. Your photos gave me ideas.

I am going to incorporate your idea of the wheel exchange. And the jig below each wheel.

Great!. Now you have added another 5 hours to the project. Appreciate your advice. :med:

All the best. Anthony.

tinkerer:
Glad to help Anthony. Another thought is, you can make several different setups, kind of like tool holders for the tool post, for different angles and just snap them on the rest and grind away. Hope that doesn't add to the time, but time spent now can save later. :lol: Maybe not.

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