Author Topic: G. Thomas Versatile Dividing Head (Hemingway Kits)  (Read 816 times)

Offline samc88

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G. Thomas Versatile Dividing Head (Hemingway Kits)
« on: October 04, 2022, 09:37:46 PM »
A nice tooling project on the bench now, been looking into one for ages and got some jobs coming up in the future where I would benefit from one. The George Thomas design looks like it should fit my needs perfectly, especially with the micro attachment as well which allows practically any division. Not sure when Ill actually start this as want to sort other things out first but anyway heres some pics of what comes in the box. My first job was to sort through everything and label up the material in the kit and compare to the material list. I find it much easier to find the correct material when sifting through the box this way. The kit also has excellent drawings, Im also going to be working from the book "workshop techniques by G Thomas" which has good build notes in there.

Online Kim

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Re: G. Thomas Versatile Dividing Head (Hemingway Kits)
« Reply #1 on: October 04, 2022, 10:36:22 PM »
That looks like a fun (and potentially useful) project!  :popcorn: :popcorn:

Kim

Offline Don1966

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Re: G. Thomas Versatile Dividing Head (Hemingway Kits)
« Reply #2 on: October 05, 2022, 01:53:16 AM »
Great project and very useful tool. You will enjoy building it. I built this tool 9 years ago. There are riser plates that you can get from Hemingway and a swivel base. My built is here.. https://www.modelenginemaker.com/index.php/topic,2031.msg31584.html#msg31584


There is also a micro attachment calculation sheet also used for the dividing head. https://www.modelenginemaker.com/index.php/topic,4965.msg94796.html#msg94796

Regards Don
« Last Edit: October 05, 2022, 01:57:16 AM by Don1966 »

Offline Chipswitheverything

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Re: G. Thomas Versatile Dividing Head (Hemingway Kits)
« Reply #3 on: October 05, 2022, 09:02:48 AM »
Very much agree with Don that the VDH is a great project and a most useful addition to tooling.  Have taken a look through Don's excellent build log, wh. I had not seen.  My own VDH was built before Don's, and am a bit ashamed to say it never got painted, I started to use it prematurely..! Also made the riser blocks and tailstock for mill use.  Though making the plates using the Micro attachment is an interesting exercise in itself, I must say that I have almost never needed anything but the head in its most basic configuration, the 24 holes on the main gear get one round the usual mundane requirements. But if you enjoy toolmaking anyway, it makes for satisfying work.  Unless there is a bit of clockmaking on the future projects list, which would exploit the more elaborate dividing very nicely ....    Dave

Offline Del_61

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Re: G. Thomas Versatile Dividing Head (Hemingway Kits)
« Reply #4 on: October 06, 2022, 02:04:27 PM »
Hi, I agree its a very worthwhile addition to the workshop.

I built mine a few years ago including the riser plates. I also followed the "masters" instructions in his book "Dividing and Graduating" which is out of print but I understand is now incorporated into his book "workshop Techniques".

I made it exactly to his description including the parallel bore and split collets. It seems to work fine, I have seen others who have made the main spindle an internal MT2 instead. I cannot be bothered to make another main spindle with an MT2 !

Good luck with the project!

Regards

Derek

Offline Jo

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Re: G. Thomas Versatile Dividing Head (Hemingway Kits)
« Reply #5 on: October 06, 2022, 08:48:24 PM »
They are very nice. I have made two: One lives in the main workshop and Sexy  :embarassed: has his own https://www.modelenginemaker.com/index.php/topic,2775.msg76875.html#msg76875

The old Myford MT2 collets are really nice fitted to the nose but you might want to consider making yourself an extra spindle with a 20mm bore so that you can fit a standard ER collet chuck if you don't have the full set of Myford collets  ;) .

Jo
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Offline Chipmaster

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Re: G. Thomas Versatile Dividing Head (Hemingway Kits)
« Reply #6 on: October 07, 2022, 05:39:09 PM »
What machine is “Sexy” ?

I don’t understand the lingo.

Andy
« Last Edit: October 07, 2022, 06:09:39 PM by Chipmaster »

Offline Jo

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Re: G. Thomas Versatile Dividing Head (Hemingway Kits)
« Reply #7 on: October 07, 2022, 06:47:26 PM »
My Sixis 101 milling machine is named “Sexy” if you had ever used one you would know why  :embarassed:

Jo
Enjoyment is more important than achievement.

Offline samc88

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Re: G. Thomas Versatile Dividing Head (Hemingway Kits)
« Reply #8 on: October 23, 2022, 09:40:15 PM »
Thanks all for the comments, Im glad to hear its a useful tool when done. First parts have been made this evening, namely the brass spindle clamp along with its steel spacer and the two steel cotters for clamping the overarm for the tailstock support. All simple turning jobs really, I need to get another die for the second cotter as the one I used for the first one left the threads not particularly pretty (although the nut does go on nicely with little slop, I think its just a bit dull). I'll hopefully get some more done this week with some machining pics (I forgot earlier). I have also been making a part to repair my friends chimney sweeping brush which has taken up some time this evening as well

Offline Bruno Mueller

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Re: G. Thomas Versatile Dividing Head (Hemingway Kits)
« Reply #9 on: October 24, 2022, 12:12:53 PM »
I built the device a few years ago.
I converted the drawings to the metric scale.
In total I made three spindles for it.
1. the spindle provided according to the drawing.
2. a spindle with ER 25 collet chuck.
3. a spindle with a mounting for a small jaw chuck.
« Last Edit: October 24, 2022, 12:20:48 PM by Bruno Mueller »

Offline Chipswitheverything

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Re: G. Thomas Versatile Dividing Head (Hemingway Kits)
« Reply #10 on: October 25, 2022, 09:28:16 AM »
Interested to see your example of the dividing head, Bruno, and your other versatile components.  The accessory that I very frequently use, probably more so than the split collets made to GHT's schedule, is the insert mandrel that has a threaded spindle nose identical to the chuck mounting on my Myford lathe.  Very usually I will transfer the chuck, four jaw included, straight over to the dividing head, with no need to disturb the component being machined.  Dave

Offline Don1966

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Re: G. Thomas Versatile Dividing Head (Hemingway Kits)
« Reply #11 on: October 25, 2022, 05:34:22 PM »
The Chuck adapter you have is a plus for this dividing head Bruno. Using the threaded spindle the Chuck wants to unscrew doing certain procedures. With three securing screws and flats on the shaft on Bruno’s Chuck adapter and the Chuck back plate the Chuck is secure. I also have the threaded adapter for the Myford collet Chuck.… :ThumbsUp:


Don
« Last Edit: October 25, 2022, 05:39:10 PM by Don1966 »