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eskimo
2nd Jun 2018, 06:59 PM
373583373584

KBs PensNmore
2nd Jun 2018, 09:01 PM
Nice bit of machining, what's it do???? A new part of a toolpost?
Kryn

eskimo
2nd Jun 2018, 09:33 PM
My variation of the "logan ball turner" Kryn....google will bring it up
Still have the indexable holder bit to go.

KBs PensNmore
2nd Jun 2018, 11:39 PM
Thanks for the explanation Richard.
Kryn

eskimo
12th Jun 2018, 06:43 PM
Duh!!!!
Back to the drawing board...must do more research before I attempt these things...

when I made what you see in the pictures above aint going to work...the cross slide wont make lathe centre...lol

Options
Make new base to fit existing top slide bolts , but that will mean having to dismantle the ball turner every time to fit and remove

Make a plate that uses existing top slide bolt holes but make it a tad longet so that ball turner can be fitted closer to centre...but then size of balls reduces

Drill and tap holes 2 new holes into rear of cross slide to accept what I have made to date.

any others?

what would you do?

shedhappens
12th Jun 2018, 08:14 PM
I was going to suggest that it would be an opportune time to make a new and slightly longer cross feed screw, then i notice your y scale.
I guess a new base might be easiest, if the rear mounting bolt is at or past centre can you incorporate your centre pivot bolt
as a mounting bolt?
cheers, shed

eskimo
13th Jun 2018, 12:23 PM
I was going to suggest that it would be an opportune time to make a new and slightly longer cross feed screw, then i notice your y scale.
I guess a new base might be easiest, if the rear mounting bolt is at or past centre can you incorporate your centre pivot bolt
as a mounting bolt?
cheers, shed

the big problem with making a new base that will use the existing bolts means having to dismantle the turner every time to fit. The ball turner has a tapered roller bearing within it and would be a pita
373802
The plate I made as seen under base works but lessens the dia of ball that can be turned. It also allows it to use the existing top slide nuts but without having to pull the turner apart.
373803

Hence why I thought of making two new holes at rear of cross slide would be the go.

I might just forget about it and find another project until I think of a bloody good idea....or better yet until someone else thinks of excellent idea

KBs PensNmore
13th Jun 2018, 07:21 PM
Is there a reason that the part with the bearing is round?
Would it be possible to machine off back, the thickness of the plate and bolt it back onto the plate with CS screws?
Failing that, machine down the area where the bearing goes, the thickness of the plate?
Kryn

eskimo
13th Jun 2018, 09:39 PM
Is there a reason that the part with the bearing is round?
Would it be possible to machine off back, the thickness of the plate and bolt it back onto the plate with CS screws?
Failing that, machine down the area where the bearing goes, the thickness of the plate?
Kryn

Thought of doing that but I would have 2 holes that I know should not be there. Wont be able to recountersink those holes which are for recessed socket head round screws. Could try to machine them out I suppose??? And then drill 2 new holes and countersink...then take some off back???
Ta Kryn...will have a look at that toomorrow.

is there any problem with putting to 2 holes in cross slide. After all there are two at rear which are 8mm and used for taper turning attachment...so the manual says...and no i wont be able to use those ....looked at that possibilty.

KBs PensNmore
13th Jun 2018, 11:20 PM
[QUOTE=eskimo;1935840]Thought of doing that but I would have 2 holes that I know should not be there./QUOTE]

If you're that concerned about the holes, slightly countersink them, fit a bit of rod in the holes then peen them over, and file/machine flush. Problem solvered.
Kryn

simonl
14th Jun 2018, 07:26 AM
Hi there,

I made the same or similar ball turner a few years ago. Ill show you some pics of mine when i get home.

I used the bolts on the cross slide (where the compound goes) but i didnt use another plate. My lathe is a standard Chinese 12x36.

Simon

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eskimo
14th Jun 2018, 11:59 AM
Hi there,

I made the same or similar ball turner a few years ago. Ill show you some pics of mine when i get home.

I used the bolts on the cross slide (where the compound goes) but i didnt use another plate. My lathe is a standard Chinese 12x36.

Simon



Using those mounts on my AL960 wont allow it to get to centre...thats why I need an extension plate or new holes in cross slide or new base and or as what else Kryn is saying...

and I notice that no one is telling me I cant put 2 new threaded 8mm holes in the cross slide...but then again you aint telling me I can:(

simonl
14th Jun 2018, 02:06 PM
Hi there. No one will tell you its ok to drill holes in your top slide just as no one told me it will be ok to disassemble my mill spindle!

But i did and it was ok. People are reluctant to give you the ok to do stuff like this because they worry it might end up being bad and stuffing up your expensive machinery (righfully so). Sometimes you just need to weigh it up for yourself and decide whether to take the plunge or not. I dare say 2 extra holes in your top slide will not have a huge impact BUT think twice and cut once. If im unsure about something like this then it sit on it for a bit..... sometimes for too long. I tend to procrastinate with things im scared ill stuff up. If i dont do anything then i havent made a mistake.... but thats a bad approach and ultimately i dont learn that way.

Anyway. Heres a pic of mine. With mine on the cross slide using compound bolts im able to get it in line with the lathe axis so dont have the smae issues.

I also opted for a HSS cutter as that also gives me some flexibility that a fixed tc indexed cutter cant. I was going to make another tool post that hols an indexable cutter but am yet to find a need.

Good luck with what you decide!

Simon

https://uploads.tapatalk-cdn.com/20180614/7b96bc6842505bfb3306f1d03df4d7db.jpghttps://uploads.tapatalk-cdn.com/20180614/18029fda8b6ff530e01f1c69e38a496d.jpg

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eskimo
14th Jun 2018, 06:10 PM
Tks Simon
If I use the nut for the cross slide as one of the fastening points I would only have to drill and tap one extra hole.
I could possibly use one of the rear holes (used for taper cutting attachment) but it would mean i would have to remove the slide to drill n tap the hole as it be above the ground surface of the way. And i dont want that. To use the rear hole and drill n tap another closer to centre away from way would mean that turner wont be sitting symetrically....if thats the word....on the slide and wont like good

simonl
14th Jun 2018, 06:14 PM
With the cross slide at full extension, how far away is the pivot point of the ball turner from the spindld axis?



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eskimo
14th Jun 2018, 08:19 PM
Roughly 28mm

simonl
14th Jun 2018, 08:24 PM
Yea thats a fair way. Makes it impossible to make small balls let alone concave or coveing.

I would make 2 new holes if using an existing hole looks terrible.

Simon




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shedhappens
15th Jun 2018, 06:04 PM
https://www.youtube.com/watch?v=nWiKvNDTjB4
cheers, shed

eskimo
1st Jul 2018, 09:01 PM
Still working on it.....winter gardening etc etc and generally to cold in the shed etc etc has slowed progress a tad.
374007


At this stage i will be taking Kryn's advice of machining base and plate so i achieve a reasonable height of inserts....if it fits!!!!

eskimo
6th Jul 2018, 11:23 AM
hooray..it works
The two bigger holes in the base of ball turner are for weight reduction..aka holes that were sacrificed to gain extra height of insert holder
374082

I took some off the base top and bottom which allowed top section to come down giving good clearance for decent size balls. And I didnt have to drill holes.
This is the plate that the ball turner bolt onto....which uses existing top slide fastening holes. The threaded hole in the RH corner is for the CS socket head screw to screw in when not in use.
374083
The one on the handle varies from 29.56 - 30.73mm...slightly out of round as I had no idea on how to use it...but I now know where I went wrong:p..which might help next time..lol.I am supprised as to how smooth it is to use. Probably the taper roller bearing...which reminds me I must pull it apart and grease it...I only oiled it when I put it together.

KBs PensNmore
6th Jul 2018, 02:58 PM
Nice to see that it's working. Where did you go wrong to get the ball out of round, just so we know not to suffer the same mistake experience?
Kryn

eskimo
6th Jul 2018, 04:38 PM
I went past centreline of chuck...i did only eyeball it
The one I made for waldown DP tablelock is only 0.09mm outoff round...good enough for me.

KBs PensNmore
6th Jul 2018, 07:24 PM
.09, Not bad for an eyeball.:2tsup: Nice work on the ball turner too.

eskimo
6th Jul 2018, 08:20 PM
.09, Not bad for an eyeball.:2tsup: Nice work on the ball turner too.

That was the second ball that i took more care doing