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28th June 2015, 09:05 PM #61.
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Neat Ian.
Peter had some very thin cut off discs amongst his collection of grinding wheels. I made the bore of my spanner deep enough to accommodate the additional exposed spindle thread when a thin disc is mounted.
I was very tempted to set the 1 up for some cylindrical grinding this afternoon. I wanted to finish a 55mm length of 4140 to as close as I could get to 15mm. Piked out and resorted to wet and dry wrapped around a file. Another time.
Bob.
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28th June 2015, 09:24 PM #62Senior Member
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Bob
It probably wouldn't have the reach to tighten that far as it stands but I could always put it back in the lathe and bore it a little deeper at need.
Regards
Ian
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28th June 2015, 09:30 PM #63Philomath in training
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Or make up a spacer (with appropriate recesses) to go under the existing nut when clamping the disc.
(Someone had tried that with my surface grinder although without the recesses so it did not work all that well)
Michael
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28th June 2015, 11:43 PM #64Intermediate Member
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Bob,
A wise move. It is pretty difficult to remove what can be done manually with wet & dry, on a cylindrical grinder, let alone a T&C grinder. You may recall that I had a Myford cylindrical grinder, which had a counterweighted grinding head with in-feed of tenth of a tenth. With coolant and a few thousandth to remove very accurate dimensioning was the norm.
I did do some cylindrical work on the Hercus before the Myford turned up. With a bit of weight hanging from the front of the table to give the lead-screw something to bite on and a 1/10th clock it was still tricky. I found that without coolant on small diameter pieces of any length, very fine passes were required.
All the stars have to line up if you start with only a few tenths to take off!
Peter
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29th June 2015, 11:40 AM #65.
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Thank you Peter,
It seemed like a poor alternative to be reaching for the carorundum paper when the grinder was sitting there but I thought I'd probably fool around for an hour or so setting things up and probably cock it up anyway. The part I was making didn't require extreme concentric cylindrical accuracy, it's a component of the Schaublin universal vice's stop assembly and the finish was more an appearance thing. At the end of the day it looks and fits OK.
Bob.
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29th June 2015, 12:00 PM #66.
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Here is a sketch of the dresser bracket Ian.
Let me know if you want a photocopy slipped in the mail. I will probably draw the pulley tomorrow.
Bob.
SKMC36015062908080.pdf
SKMC36015062908010.jpg
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29th June 2015, 02:43 PM #67Senior Member
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Bob, Thanks so much, that isn't a sketch its a work of art! It is very generous of you to take the time to do such a careful job. I had better do a decent job of making it up to do justice to the 'sketch'. In a week or so I will be here on my own for a couple of days and that looks like the perfect project for a couple of days of quality shed time.
Regards
Ian
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29th June 2015, 04:02 PM #68.
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Here's the pulley Ian.
The original is mild steel. The drawing title should read Internal Grinding Attachment. Yellow trace is like tissue paper, you can't make corrections. Sorry.
Bob.
SKMC36015062912440.jpg
SKMC36015062912430.pdf
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29th June 2015, 09:09 PM #69Senior Member
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Another wonderful drawing thanks Bob! Interesting that it is made of mild steel, looks like I am on the lookout for a piece of 1" plate or perhaps a hunk of 4" bar might be easier. I wonder if (as it is doing 3K rpm) if it needs to be balanced? Time for some careful thought about how best to machine it up.
Regards
Ian
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29th June 2015, 09:46 PM #70Philomath in training
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Ian, I can probably spare you a short piece of 4" (or there abouts) round to make up a pulley.
As far as balance goes, provided that your machining is concentric it should automatically be in balance. I'd probably make that by boring a hole in the centre and then clamp it up on a mandrel to do the rest.
Michael
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29th June 2015, 10:52 PM #71Senior Member
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Thanks for your kind offer Michael! I will send you a PM.
Yes, I thought a mandrell would be the way to go. I have to pull the shaft once more to replace the belts and was wondering about using that as a mandrell?
Regards
Ian
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30th June 2015, 08:16 AM #72Philomath in training
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5th July 2015, 07:18 PM #73Senior Member
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Bob - this is what I have turned your drawing into, the dimensions changed a little as I had to fabricate it but the heights and the angles are as close to the drawing as I can get it.
IMG_0325.jpg
Thanks to Michael G I have the steel to make up the pulley to drive the internal grinding spindle but I think that I will chase up the belt before I have a go at making it up.
Regards
Ian