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Winner A Dividing Head By Wayne

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wayne.inspain

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Hi Randall With those extra 4 holes I am able to tune the disc in to a local radio station, bit of a result hey !! I wish.
 

wayne.inspain

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I decided to work on the sector arms today, I was wondering how to hold the two arms rigidly together and cause friction between the boss they fit on. They need to move as a pair but stay where you put them.
DSC_0012[1].JPG

my solution was to chamfer the inner edges if both arms so as to clamp a tight fitting o ring.
DSC_0011[1].JPG

The o ring has been stretched so it will fit on the boss.
DSC_0015[1].JPG

The o ring is clamped between the two arms, they move as one and stay where you put them. I will make a brass washer for the bolt, and a collar to keep the arms from moving forward, although that might not be needed. The arms are too long because I want 125mm division plates and the one fitted is only 98mm. Tomorrow I will fit the 4 jaw chuck.
 

wayne.inspain

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I couldn't wait till tomorrow, I wanted the chuck on today.
DSC_0016[1].JPG

No messing with the chuck, I set up the spindle of the dividing head vertical in the mill clamped the chuck on top, clocked it in
and drilled through the chuck and in to the spindle flange. opened the holes in the chuck to 8mm counter bored with an end mill for 8mm allen head bolts,
threaded the spindle flange dedurred and bolted it on. Not that it matters much on a four jaw but for interests sake I clocked the chuck on the spindle and
there is 0.01mm run out, I was gob smacked. The indexing plunger is complete, the worm shaft spacer is on, the flat milled for the worm set screw. Spindle
locking bolt to do, far end plate to round off, and the graduations on the main barrel next.
 
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Randall Marx

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Looking great! I'm really enjoying the progress you are making on this project and love seeing the high-quality workmanship. Thanks again for sharing this with all of us! :D
 

wayne.inspain

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Hi Randall Thank you for you reply. I am encouraged you are enjoying the progress I am making, not so sure it is the highest of quality but I am pleased with
it so far. I have not been able to progress as fast as I would like just recent, extra chores at home, you know how it can be some times. :blue: Should have time to do some tomorrow evening:)
 

wayne.inspain

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Time has been a bit short just recent, but managed to do a few more things.
DSC_0037[1].JPG

The spindle lock was from a 8mm shaft from a printer with off cut of 12mm pressed on the end cross drilled for the 6mm t bar to be pressed in. The other end
reduced and threaded m5. I will make a division plate over the week end if I can get some 125mm wide flat bar.
 

wayne.inspain

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I thought I would show the tools I have had to start this project with.
DSC_0039[1].JPG

I have not shown the lathe or the milling machine that has a vice and a clamping set, or the taps and dies and drills and bits of beer cans I cut up for shims!!
I had 5 pieces of 6mm by 6mm tool steel 3 of them you can see here the others have been cut up, and that was it.
 
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Absolutely AMAZING. It looks great.
 

wayne.inspain

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Hi, been recent not had much time for hobby work. Next task on the dividing head is to put graduations on the barrel, I made a degree wheel out of some aluminium sheet and a downloaded print I found on line and fitted it to the spindle of the lathe, mounted the barrel of the head in the lathe and used my thread cutting tool on it's side to cut the graduations.
DSC_0042[1].JPG


DSC_0041[1].JPG

I then made a little marker plate from an old brass name plate I found off an old bed. I drilled and tapped the main plate but broke the 3mm tap in the hole
and had to re-drill at the side, that is why the slots in the plate are not of equal length.:frown 2: I haven't put any numbers on the barrel, it is easy to count the divisions, I haven't got room any way!
DSC_2121[1].JPG

I next wanted to use the head to see if it would do it's job, I decided to make a flanged nut for the indexing plunger. I turned the end of a piece of brass
bar to the flange diameter drilled and tapped it on the lathe, centered it on the four jaw on the dividing head then mounted everything on the mill.
DSC_2127[1].JPG

The eagle eyed of you will see that the whole of the indexing assembly is on the other side of the dividing head, because every thing is symmetrical
it fits on either side. The dividing head ratio is 60 to 1 so each full turn of the handle is 6 degrees, 10 turns of the handle gives me 60 degrees for the sides of the nut. Removing backlash, tightening spindle lock between cuts, 6 cuts later
DSC_2130[1].JPG

Parted off on the lathe and a bit of a clean up.
DSC_2133[1].JPG

And this is with it fitted.
DSC_2179[1].JPG

The thing works as it should and if I was happy to leave my spur gear in the head I suppose it would be about finished. But I am not happy to do that so next
up is to try and make a worm and wheel.
 

Superburban

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Excellent job, I love the design.

The dividing head ratio is 60 to 1 so each full turn of the handle is 6 degrees, 10 turns of the handle gives me 60 degrees for the sides of the nut.
I have not done the math on all the combinations, but on the surface 60 to 1 sounds so much more practical then 40 to 1.
 

Silverbullet

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You young man have done a great job. This tool you will have to use the rest of your working life. I went to vocational school and made tools as my test projects and that was over forty years ago. Still have the tools and the memories. You will to , and the buggers , or blunders will only make you better. Don't be afraid to try to make the things you need. And if you think your way works do it. Then you know if it will or won't.
Very nice build , clear explanation of it too. We will be watching for more.
 

wayne.inspain

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Hi Thank you all for your comments, they are as always very encouraging and inspirational. I am not sure over all whether 60:1 or 40:1 is better, 60:1 you have to turn the handle more but 60 seems to divide into 360 better. I think the big deciding factor that really sways the decision for me is that I didn't have a 40 tooth spur gear!!!
 

wayne.inspain

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Hi Superburban, I am glad you like the design, so do I, I wish it was mine, but I have Mark to thank for the design and the encouragement along the way to complete it to this stage. :applause:
 

34_40

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Spent a few evenings reading through this whole thread and I gotta say that I think you are the furthest thing from a newbie!
Both you and Mark (and many others here!) show some amazing creativity and help folks like me think of ways of using our machines in ways
we haven't yet thought of.

If I can ask, should you do a set of drawings.. can I request a set? I have to admit, I can't fathom how you did it all without a basic set of drawings!
But I did want to say thanks for making time to post all the pics and share the experience with us all. It is an inspiration to be sure.
 
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Congratulations on the POTM award.

"Billy G"
 

wayne.inspain

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Hi 34-40 thank you for your comments, as this is my first project of this kind of engineering I do consider that I am still a newbie, (I double checked the spelling this time)! I haven't done a set of drawings for the dividing head I took what materials I had kicking about and worked
on dimensions that suited the materials. I will do a set of basic drawings as guide lines, and make them available to any one that wants them.
Hi "Billy G" thank you for your congratulations, but could you tell me what the POTM award is.
 

wayne.inspain

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Got it! Project of the month. WOW thank you. Considering the fantastic work that is done by the members of this forum I never would have expected this.
 

Downunder Bob

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george wilson

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wayne,be careful. Those ground HSS cutters are not accurate to use as parallels. If you measured them(which you may have already done),you will find out that they can be several thousandths different in size. Even the small ones can be quite different in their sizes.
 

Downunder Bob

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I thought I would show the tools I have had to start this project with.
View attachment 132730
I have not shown the lathe or the milling machine that has a vice and a clamping set, or the taps and dies and drills and bits of beer cans I cut up for shims!!
I had 5 pieces of 6mm by 6mm tool steel 3 of them you can see here the others have been cut up, and that was it.

You have done well Wayne. Obviously well experienced at machining, possibly even formally trained. That is quite a project. You'll have earned a beer or six and a rest when it's finished.
 

Downunder Bob

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Hi Thank you all for your comments, they are as always very encouraging and inspirational. I am not sure over all whether 60:1 or 40:1 is better, 60:1 you have to turn the handle more but 60 seems to divide into 360 better. I think the big deciding factor that really sways the decision for me is that I didn't have a 40 tooth spur gear!!!
You can make one now if you want one.
 

Downunder Bob

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wayne,be careful. Those ground HSS cutters are not accurate to use as parallels. If you measured them(which you may have already done),you will find out that they can be several thousandths different in size. Even the small ones can be quite different in their sizes.
A far cry from the good old days. During my apprenticeship in the early 60's we often used square HSS tool bits as parallel bars quite often, they were pretty reliable up to .0005". Of course for greater accuracy we did use toolmakers parallel bars .
Mind you we only had the best Quality Fagersta Brilliant from Sweden. I still have a box of them from back then , still in the original blue box. Also have some Carboloy AR6 78B cemented carbide bits. As these tools are over 50 years old now I'm hoping they don't deteriorate with age.
 

Lornie McCullough

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Hi Wayne in Spain.... read the whole thread from beginning to end in one sitting. Excellent work, and very inspirational!!

I look forward to your future projects.

Lornie
 

Round in circles

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I've spent just over two hours of my life reading this thread from start to finish ....on of the best investments I've made for a while Wayne , thanks for the posts & pictures .

Now , how do you reckon I can built my home made mill using only a 10 inch throw 1943 ( ish ) Sphere / Atlas thread cutting back lathe & tooling similar to yours ,plus a multi mode welder set & two pieces of bent string . ?
 
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