Boring Bar Setting Device - for between centres

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Dean W:
Good job on the tool setter, Chris. Looks nice, and it will surly be useful!
You're putting a lot of good ideas to use for getting your engine built. Keep at it.

Dean

kellswaterri:

--- Quote from: raynerd on January 08, 2011, 11:20:15 PM ---I posted after Christmas about how to go about boring for my Webster engine in a which a few of you suggested boring between centres.

http://madmodder.net/index.php?topic=4093.0

Although I was very near to making a standard boring bar and having a go with that, I decided that I would like to attempt to between centres as it is something I`ve not done before. Rob Wilson posted regarding making a device to measure the distance or reach of the boring bar which in my opinion was an excellent method to accurately measure this. He kindly helped me with plans for this device so I went ahead and built one... cheers Rob :beer:

A piece of scrap ally I rescued months ago!

The main 2 pieces cut to shape with the guide rods. I deviated from the plans here which stated to bore 1/4" and loctite the guide rods into the top T shaped piece. I didn`t fancy that, so I decided to only drill 2/3 of the way through the top piece and thread the top of the guide and screw it in position. Will probably use some thread lock on final assembly. I`m pleased with this, it looks tidy (not drilled through) and certainly solid. It also can be disassembled should it need to be.

This sort of shows how it will work. The two V slots will clamp down onto the boring bar with them bolted together using the guide bars. I now need to make a plate on the top which will hold a DTI and a plate on the bottom which will hold the adjusting screw.

I finally completed the boring bar setting device after many more hours than expected.

Here are all the parts required. I have used stock M3 screws for the supporting brackets and a stock M4 screw for the grub screw to hold the dial in place.

The plans also required that a flat button is made for the DTI in use so that you can measure the maximum projection of the boring bar

Initial mock setup on a piece of ally bar. I`ll be using a steel bar for the boring bar when I get around to cutting it. It works by turning the screw at the bottom which will push the tool steel through the boring bar and the DTI will measure the distance and therefore the bore radius.

And a final assembly

I guess the next step is using it but I need to figure out how to mount my work to the saddle.

--- End quote ---

Hi folks...spotted the posts for the between centres boring bar just what i need... i am now in the process of making one after trying
ordinary boring bar ...too much vibration...then set up for a boring head cut away merrily until it reached where the vibration started
then the cutter jammed ......obviously some discussion was needed with a proper machinist... we both agreed that there was a hard
spot in the core centre...this would best be tackled with a between centres boring bar with the job set up true to the bar
he reckoned that it should cut a clean path...i tkink the between centres set upis the strongest set up of all in this case...
all the best folks,
kellswaterri...John,

vtsteam:
Thanks for resurrecting that thread, kells, I hadn't seen it before. :clap:

Fergus OMore:
Really, it is all a lot of fuss for not a lot.

I made up a pair of inline boring bars to 'do the bores' on a Quorn. One was for a notional 1.25 whilst the other ( which I still have) was for the precise 1" and then 1.003". Provided one puts a controlled advance of the bit- say 1/4" x 40TPI and the right angle to control the advance- that is it. Mine came from the words and music of George Thomas in Model Engineers Workshop Manual.

In all of this, one bores TWO castings- with four holes- each pair parallel to one another.

Surprisingly, it is a lot simpler than having to make a boring bar anyway and then an expensive Gizinta and then a bracket. Pretty, but well?

Norman

vtsteam:
Norman, alternatives to the way you do things are just a fact of life. It's not necessary to put them down. You're welcome to show and explain useful alternatives yourself which would be great, and probably useful to others. But cut the cryptic swipes, please.

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