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CNC / Re: Schaublin 125-CNC retrofit to LinuxCNC and Mesa cards.
« Last post by RotarySMP on Today at 09:49:10 AM »
Thanks for that. I knew it was only a small amout, like 15 or 25%, butit is nice to see the table with the amount in g. I'll use that.
Mark
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CNC / Re: Schaublin 125-CNC retrofit to LinuxCNC and Mesa cards.
« Last post by Pete. on Today at 09:03:58 AM »
Looks like there's very little grease in those bearings, but then again most people tend to over-grease them. When I put new spindle bearings into my Hardinge lathe I looked up the manufacturer's spec for the amount of grease to use and I was surprised at the small amount required - 4.6cc

 
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CNC / Re: Schaublin 125-CNC retrofit to LinuxCNC and Mesa cards.
« Last post by RotarySMP on Today at 06:04:02 AM »


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New from Old / Re: Making-A-Taper-Gauge
« Last post by awemawson on April 10, 2021, 12:25:02 PM »
There is a 1/4" Whitworth tapped hole in the driving end with a cap screw in it that engages a tab on the rotating bit. (Tab held in a left hand threaded 3/8" Whit bolt that had me puzzled until I remembered it's handedness (original J&S feature)
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Our Shop / Re: My week this week, my workshop videos!
« Last post by awemawson on April 10, 2021, 12:21:53 PM »
Phil, despite what you say in the video, it would be far easier to cut the tops of the shelf uprights to the same length then invert the shelves than dismantle and rebuild them. They are a pain to do, especially single handed as they wobble all over the place.

AMHIK !!!!
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New from Old / Re: Making-A-Taper-Gauge
« Last post by WeldingRod on April 10, 2021, 12:19:31 PM »
How are you driving that test bar?

Sent from my SM-G892A using Tapatalk

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Our Shop / Re: My week this week, my workshop videos!
« Last post by hermetic on April 10, 2021, 11:39:17 AM »
A short week in which great things are achieved, and we break through from frustation to the sunlit uplands of progress! The wheelhorse bonnet scoop comes together, and the arrival of new shelves means more storage space in the near future, A bit of commando gardening Down the yard, and a portable forge which I really do not know what to do with as yet, but ideas will come to me!
Phil, in sunny,Bright, cold and snowy East Yorkshire
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New from Old / Re: Making-A-Taper-Gauge
« Last post by awemawson on April 10, 2021, 11:00:37 AM »
Of course I couldn't leave it at that - I had to get that last bit of non-parallelism out. A couple more iterations and it was gone to the limit of my measuring capability  :thumbup:

However while doing it there were ominous growlings from the work head - a bearing not sounding too good. I eventually tracked it down to the front motor bearing on the work head -  the grease had dried out. However getting at it involved rotating the entire work head on it's swivelling base thus loosing my parallel setting  :bugeye:

Now the base is graduated and the graduations are on a good diameter so you can get it back close to where it was but never exactly the same place! OK another round of grinding that bar and I eventually got it back spot on where we were a couple of hours ago. The reason for the dried up grease - one of the grease nipples was blocked and not actually passing grease to the bearing - nipples both changed and the bearing seems no worse for wear.

Now years back I had made a big test bar to aid setting this machine up - just a 3-1/2" bar accurately centred and ground, I've even made a nice wooden box for it, but when I recently got it out of the cupboard I noticed a couple of small spots of corrosion despite having been sprayed with preservative.

So as I type this it is having a thou taken off back to a fair finish (I hope!)

A machine like this grinder has too many degrees of freedom. The work head can swivel, the grinding head can swivel and raise and lower, and of course the main upper table can swivel - all these movements make setting up great fun, and also as you slide the tailstock up and down the ways it will be pointing ever so slightly in a different direction ! Even clamping the upper table results in a very small angular movement - it's tiny but when trying to split tenths of a thou tiny counts !

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New from Old / Re: Making-A-Taper-Gauge
« Last post by awemawson on April 09, 2021, 03:40:33 PM »
Not been able to get a lot done over the past few days due to other commitments, but I HAVE managed to set up the 1300 and do a test grind for parallel.

Just a bit of 32 mm hot rolled bar from the scrap bin, faced and centred at both ends, and set up in the cylindrical grinder to test for parallel grinding. First go produced a difference end to end of 5 thou over the seven and a half inches of the bar.

Now many years ago I produced a crib sheet for removing tapers in the grinding as it gets quite tricky working out what needs rotating and how much. The 'top table' of the grinder swivels on the travelling table, the pivot being in the centre. By knowing how much the part tapers and over what length, and which end is bigger my crib sheet tells me how much to move the end of the table. In this case the 5 thou taper 'should' be eliminated by 10 thou movement which I of course then applied. This has reduced the taper to five tenths of a thou over seven and a half inches. A bit of persistence would get rid of that but it's quite near enough for what I'm doing.

I was pleased with the ground finish considering the grotty but of steel that it was !



May get a bit more time tomorrow.
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PowerSports / Re: 1996 Chevy Silverado K1500 Pickup
« Last post by awemawson on April 09, 2021, 01:59:20 AM »
Stay doing the fishing that you enjoy, sell the Perch and pay someone else to fix the vehicle!
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