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Old 07-26-2017, 05:15 AM   #111
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Default FOR COGSY test bar accuracy

Just for you[ATTACH]Click image for larger version

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Old 07-26-2017, 06:12 AM   #112
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Thanks for the explanation Baz.


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I'd like to be a perfectionist, but I lack the patience...not to mention the skill...
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Old 08-13-2017, 05:51 AM   #113
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Default 70th birthday

I have not been in the shed for a while as the weather has been bad
and i dont have any current projects on the go.However today is nice and sunny
so i decided to do a little gardening and was drawn to tidying up the shed
For my recent 70th birthday my son in the UK sent me a hamper.Worldwide beers,nuts etc all hosed in a nice wooden tray.As i worked thru the beers
i wondered what i could use the tray for,it has a nice brass engraved plaque
on the front.I put it in the shed and today idally browsing/musing etc
i found the tray was a perfect fit in a recess between the mini lathe and mill
When i say a perfect 2mm smaller on the width,3mm high and perfect on the depth.All it needed was a lid and made an ideal collet drawer with bits of scrap
Fitted a tray and a couple of knurled brass thumbscrews from my stock
All in all a pleasaClick image for larger version

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Old 08-13-2017, 06:10 AM   #114
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Happy belated birthday greetings--- young man.

Weather in the Newcastle -- upon Tyne variety is dis-buggerable and piss- instantly raining.

Little wonder that I have moved a lathe indoors where the central heating is chugging on. It's supposed to be summer.

Best Wishes

N
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Old 08-13-2017, 06:45 AM   #115
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Hows the lathe going Norm ? Havent heard much on your thread
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Old 08-13-2017, 07:29 AM   #116
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I'm waiting for my shed to be erected-- or is it an ark?

However, the Sieg has got a new 4 jaw independent chuck, a faceplate, a ER25 collet holder and the start( eventually) of a fitment to take Myford stuff as well.

Again, I've got the saddle DRO repaired and working.

Obviously the tee bolts and whatever for the subtable are 'on hold' until the shed is erected and re-furbished.

On another front, there is 'balls up' with the tax people and I have still to finalise my wife's estate despite it being almost 2 years now.

I'm not miserable or whatever, merely trying to see an end to a few things

Lots to come

Patience fleas, the night is long

from Cervantes in Don Quixote by Sancho Panza
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Old 08-23-2017, 05:18 AM   #117
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Default Capstan alignment

I dont have a new project on the go yet so thought i would play about
with the MT3 test bar i made for the specific job i had in mind when
i made it,that is to improve the capstan alignment on the mini lathe
I had purchased a couple of cheap chinese dial indicators .I made a dedicated mounting brkt to suit the mini lathe QCTP. Fitted and checked the test bar
in the MT3 headstock in a no of positions.Over the full length the bar was
only 1 thou eccentric and showed the lathe carriage and headstock to be
miscaligned by 6 thou front to back and 3 thou vertical.As long i know i can live with it for now.To improve will mean shimming the headstock etc
Then used the test bar to align the 6 stations on the turret.Not perfect but
getting nearer.May now try to fit the boring head in the lathe and take a small
skim of the bores.Which will then mean refitting the station toolholdersClick image for larger version

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Old 08-25-2017, 02:45 AM   #118
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Default test bars on both lathes

Whilst pondering my next project and doing a tidy of the shed and
making a few bits and pieces to store/rearrange often used items,
whilst i still had the test bar setup i decided to check both lathes
I setup 2 dial indicators to front and top and got the following results
over the 10" length of the test bar
Sc3 concentric to ,half thou at HS and ,2 thou at TS ends
Carriage was parallel HS +/-3thou both top and bottom
Sc4 concentric to half thou at HS but 3 thou at TS (? unsupported but improved to 1 thou with tailstock centre engaged
Carriage was parallel to 1 thou both top and bottom
I dont plan to do anymore at the moment as long as i know.I dont think its too
bad for cheap chinese bench lathesClick image for larger version

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Old 08-27-2017, 06:08 AM   #119
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Default Dovetail and gib adjustment

As most people know its difficult to adjust the dovetail gibbs on the mini lathe
Impossible with as bought units but there are many mods to improve this
However like many others i am never content with what i have and am
continually chasing the true.I was still not happy with my slides so
while i had the stripped down decided to further improve.Started with the compound made a new brass bibb strip and added 2 more adjusting screws
Photos tell the story,the difference is amazing.Will see how long it lasts
Will see what i can do next with the cross slide and carriage

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Old 08-27-2017, 07:11 AM   #120
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I suppose that the next 'improvement is on the points of the gib screws and the others are a lock and a pin to stop the gib wishing to attempt to leave the set up.

I have a vertical slide( ? ex-Perfecto) with those- and a Myford dial in that strange Chinese metal.

I was thinking that instead of the difficulty in construction for people like JCSteam, the existing gib can be asses to with glued shims. A bit like the Myford laminated ones!

Regards

Norm


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