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19th Jun 2015, 05:26 PM #46Senior Member
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- Feb 2012
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- Willunga
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Hi Bob
It sounds like a case of one step forward and one back with the workheads. Does yours take a drive pulley? I like the adaptors to take square lathe tooling, something that I am going to have to think about.
Thinking about using a chuck on the workhead brings me back to one of those little dilemmas which I have never resolved. When I bought the Centec it came with this dividing head, a 6" backing plate that matches the thread and a new 100mm Chinese chuck, this chuck looks and fells quite good but I have no way of really knowing how much runout it has. The backing plate also matches the thread that is on the Hercus workhead. The spindle thread on my Lantaine lathe is however quite a lot bigger.
IMG_0319.jpg
I think that there would be value in being able to move a job, in a chuck between the machines. There seem to me to be a couple of ways of getting to this point.
1 Make a adaptor to fit the Lantaine spindle and the Hercus backing plate and use this to machine the backing plate to fit the 3jaw chuck that I have. At this point I begin to wonder how good a generic Chinese 3 jaw chuck is and whether I would be better with a small 4 jaw? The 4 jaw from the Lantaine is too big for the dividing head.
2. Make two adaptors to fit the spindles of the dividing head and the Hercus workhead to bring them up to the size of the Lantaine spindle. I could then use a Lantaine backing plate to mount the small 3 jaw and or get a small 4 jaw. The 4 jaw from the Lantaine is too big for the dividing head.
I am fortunate in having several Lantaine backing plates as the previous owner used the lathe to do brake work and made a number of fixtures onto backing plates.
Regards
Ian
IMG_0319.jpg
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19th Jun 2015, 06:15 PM #47
Hello Ian,
I am following your thread with interest, but since I have no Hercus grinder (I live on the wrong continent for that) I had nothing to contribute.
I might have a idea for mounting square tooling in round collets or the like (not my idea, picked it up somewhere). Imagine 4 square pieces of stock about the length of a collet. Mill one corner off the length of each. Assemble in a square with the corners facing each other. Now you have a square hole in the middle. Mount in four jaw chuck and turn the outside to size for a collet. And voila, a set of round to square adapters.
Quite possible there is a better design or way to make them, but I hope you get the idea.
Peter
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19th Jun 2015, 06:50 PM #48.
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- Nov 2008
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- Perth WA
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Hi Ian,
If the lathe's spindle has a 3 Morse bore this might be another option. Turn up either a screw nosed arbor or an arbor with an integral back plate and use it to mount your chuck in the lathe and work head. The chuck on the left came with the grinder. The screwed arbor was supplied to fit the Hercus milling slide's indexing attachment. They are 4 inch chucks.
DSC_4577 (Large).jpg DSC_4578 (Large).jpg DSC_4579 (Large).jpg
Bob.
PS . There is a drive pulley that fits the workhead - http://www.woodworkforums.com/attach...6&d=1384007470Last edited by Anorak Bob; 19th Jun 2015 at 08:00 PM. Reason: PS added
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19th Jun 2015, 08:00 PM #49Senior Member
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- Feb 2012
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- Willunga
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- 114
Hi Peter
Great to hear from the Netherlands! Thanks for the the suggestion, I will keep it in mind but I think that it will be some time before I get to make this up. Doing this machine has rather caused the other projects to back up...
Hi Bob
That arbor is very impressive. Unfortunately the lathe has a really odd spindle , they call it a 4 1/2 mt in the manual, this means that 35mm can me run through the spindle. It comes with an 2 mt adaptor and I have put a collet chuck in this at times. I guess it would be possible to make a 4 1/2 to 3 adaptor using the existing 4 1/2 to 2 adaptor to set the outer taper but it would be a very big challenge at my skill level. One to think about for the future.
Regards
Ian
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19th Jun 2015, 08:40 PM #50.
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- Perth WA
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Hi Ian,
Could you just make a 4 1/2 arbor with a 1 1/2" x 8 threaded nose? A correspondingly threaded small 4 jaw could then move from the Lantaine to the Centec or Hercus.
Bob.
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19th Jun 2015, 09:26 PM #51Most Valued Member
- Join Date
- Aug 2011
- Location
- Melbourne
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- 4,779
Hi Ian,
I'm really impressed with how well you have cleaned up this t&c grinder. It's a lovely piece of work.
SimonGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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19th Jun 2015, 10:26 PM #52Senior Member
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- Feb 2012
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- Willunga
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- 114
Thanks Bob, that sounds much more achievable. I will put that one on the (presently rather long) list!
Thanks Simon, it has been a fun project. I was very lucky to score the machine and to find that under that dirt it was completely sound has been an incredible bonus. Every time I look at I can see another role for it so I am really pleased to have it. The help and encouragement that I have had from this forum, particularly from Bob, has been invaluable.
Regards
Ian
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24th Jun 2015, 11:38 AM #53.
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- Nov 2008
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- Perth WA
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Peter Fou's Workhead Tool Holders
I said to Ian I would provide a few photos of the holders Peter made for the workhead. These fit the spindle's one inch bore section. The 5/8" bored holder turns out to be a convenient size. I have a small collection of Hardinge sleeves that will fit. The spindle has a pair of 180 degree opposed locking grubscrews. The 5/8" bored holder has an oversize hole to facilitate the clamping of the internal sleeve.
BT
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24th Jun 2015, 12:26 PM #54Senior Member
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- Jun 2012
- Location
- ex Perth, now Mittagong
- Posts
- 105
Bob,
You no doubt have worked out that the square collet can take any sized piece of square or rectangular steel up to the maximum dimensions of the hole. Packing pieces can be used if necessary. Very handy for making !/8" for slotting tooling etc.
Peter
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24th Jun 2015, 06:26 PM #55Senior Member
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- Feb 2012
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- Willunga
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- 114
Thanks Bob and Peter, They are most impressive and would clearly do a great job of grinding HSS lathe and shaper bits. The 'to do list' is growing exponentially.
Regards
Ian
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26th Jun 2015, 08:27 PM #56Senior Member
- Join Date
- Feb 2012
- Location
- Willunga
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- 114
I made a start on making up the missing parts.
IMG_0323.jpg
From L-R the pin to hold the guards for the grinding wheel, the thumbscrew for the Y axis dial, a retaining bracket for the LH end of the bed and 2 long and 2 short t bolts. The other (Z) thumbscrew is notched for grip and as I presently don't have a knurler I thought the I would reproduce this, I was quite pleased with the outcome but I bet Hercus didn't do theirs with a hacksaw! The genuine t bolts appear to have been machined from 1' sq bar, I didn't have any and the thought of doing this with HSS tooling filled me with horror so I fabricated them from some 3/8" bolts and plate.
IMG_0322.jpg
This is one welded and one awaiting some attention form the MIG, i have held the shafts in a little 3 jaw chuck to make sure that the plate and the shaft are square in all planes. I need 2 and made up 4 on the principle that if I have a spare they won't disappear into the black hole in my shed into which I loose things. They may not be perfectly centered but they are a lot better than the camera has made them look, either that or I need to get new glasses!
Next is the arbor spanner.
I have ordered a diamond dresser for the wheels and when it arrives I will make up the fixture to hold it.
Bob - I think that the dresser and fixture is photo 17 in your post
http://www.woodworkforums.com/showth...30#post1715330s
Would it be possible to put up a few dimensions for the fixture? In particular the height of the two columns and the height and angle of the dresser when it is installed in the taller column.
Thanks
Ian
IMG_0323.jpgIMG_0322.jpg
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26th Jun 2015, 11:49 PM #57.
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- Perth WA
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Very productive Ian. Well done.
I will knock up a rough drawing for you of the dresser bracket along with the workhead pulley. I imagine there will be a difference between the earlier and later workhead pulley's bore diameter though.
Do you have the drive pulley for the internal spindle?
Bob.
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27th Jun 2015, 09:11 AM #58Senior Member
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- Feb 2012
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- Willunga
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- 114
Thanks Bob! I have the workhead pulley, it's the internal grinding drive pulley that I am missing. I am eyeing off a couple of sources of material to make it and presently a cast iron trolley wheel is the favorite over a small barbell weight left behind by my son.
Regards
Ian
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27th Jun 2015, 10:17 AM #59.
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- Perth WA
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Had I opened my eyes!
IMG_0313.jpg
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28th Jun 2015, 08:40 PM #60Senior Member
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- Feb 2012
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- Willunga
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- 114
My version of the pin spanner. This is made from my scrap bin, the head is a piece of black MS which is welded to a piece of ground shaft. The two studs are made from 6mm HT bolts. I struggled to get a decent finish onto the MS.
Regards
Ian
IMG_0324.jpg
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