Reply with QuoteThe slab of Cast Iron arrived today! I don't think the USP guy liked it very much!
I have been busy making little stainless knobs on my lathe, and had I an 8-station turret, it would have been much easier to make the 30 pieces!
Thanks guys!
I just ordered 10 for $9.00 at McMaster Carr!
I fount the Neoprene 1/8 x 4.75" OD !
Now I have a few extras to sell on eBay
Can't wait for that slab of Cast Iron!!
Widgit
The slab of Cast Iron arrived today! I don't think the USP guy liked it very much!
I have been busy making little stainless knobs on my lathe, and had I an 8-station turret, it would have been much easier to make the 30 pieces!
Last edited by widgitmaster; 03-13-2007 at 10:24 AM.
45ish pounds, eh? Annoying just to hump that thing in off the front porch and into the shop.Originally Posted by widgitmaster
I've had a hard time getting Speedy to quote me a piece of cast iron that's 18" x 5" x 1" thick. I've been going by email and it has been hard. They just keep saying "regrets" and won't quote it. I guess I'll have to call and see what their story is.
I did get another outfit to quote me $125 delivered for the slab, but I really kinda wondered what Speedy's price would be before I order.
Best,
BW
Hey Bob, call Speedy's 800 number (1-888-744-4140), and ask for Marty or Anson! Tell them Eric says hello!
These guys are very helpfull, as I have spent a ton of cash there with all my little projects!
Widgit
Last edited by widgitmaster; 03-13-2007 at 10:26 AM. Reason: typo
Cast Iron Plate
Midwest Alloys out of the chicago neibhorhood 2'X5"X20" ductile $105 to my door this was last fall they will cut to size and I think they have a blanchard grinder also nice people to deal with have plate round and cored round I think they told me one time they could cast or saw 4'X8'X15' ph# is 1-800-526-0548 project look's good I thought of using a superspacer for a turitt on a DV59 conversion to CNC Keepup the good work Kevin
Today I put that slab of cast iron in my mill's vise, held it up high on some parallels, and machined all exposed surfaces flat parallel and square! This was necessary because the hot rolled surfaces of the slab were not flat, and I needed something to work from and to hold it securely.
Next I milled out the 1/4" deep track that will straddle the lathe's carriage! This was done in a few operations, 1st using my carbide shell mill to remove the bulk. 2nd I used a 1/2" 4 flute solid carbide end mill to square the inner corners and bring the track width to size.
Then I used a 5/32 4-flute carbide end mill to undercut the inner corners .025" deep. Then I use a 45° carbide end mill to chamfer the corners .025"
Then I used a long 3/4" 4-flute end mill to bring the ends to length.
Lastly, I setup my big fly-cutter so the tool radius fit inside the track, and took a .005" deep pass across the entire inside floor surface. This will be the datum surface when mounting the block and turret assembly to the lathe.
VIDEO I would have made more movies, but i forgot to put the memory stick in the camera and I was too dirty with cast iron to go inside to look for it!
Now the entire bottom of the slab is finished in one process! Tomorrow I will drill & bore the hole which will go over the post on the lathe's carriage.
Oh, that looks sweat. That plate has a lot of meat & should allow a very stable platform for your turret. I guess that just sorta worked out that way because you had to make it to a height that would center your turrets tooling, but it worked out to the good from what I can see. Should be very stable.
Your fly cutter, it hangs out the back side of the base/tool. Was this for ballancing, or its just a cutter that can take a bigger cut & just happen to be hanging out the back for the size cut you was making? Looks like it was making a very smooth cut!
Well, it looks like its getting closer to time for the turret to be making some chips for use. And I hope you make a Vid of it in action when the time comes. I guess there is still more work to be done before that will happen though. So we will be waiting on the finishing touches & the rest of the story. Thank You.
Jess
This morning I put the slab on it's edge in the vise, and removed all material except for .005" for finishing.
Next I dismantled my lathe, removing the lead screw and cross slide.
Then I put the cross slide in my mill's vise, and used the mill like a CMM to get the exact location of the post so that I can drill & bore the mating hole exactly where it needs to be!
Last edited by widgitmaster; 03-17-2007 at 08:04 PM.
Next I placed the slab on edge in the mills vise, and removed all excess material except for .005" for finishing on each edge.
Then I plaCed the slab upside down in the vise, using four screw jacks to level the finished surface underneath. To do this I used my surface gage and a dial indicator, sliding the gage on the mill's table and adjusting the jacks until I had four corners with the same zero! Then I loaded my 3" face mill into the spindle and prepaired to mill the slap to the final thickness plus .010" for finishing.
But before I started milling, I needed to calculate the exact thickness required to place the top of the turret .3750 below the centerline of the spindle!
To do this I placed a .7500" hardened drill blank pin in the spindle, and dialed it in true. Then I used my trusty old planer gage to transfer the dimension from the top of the turret to the bottom of the pin to my micrometer!
The bad news is I had order a slab .750" too thick! Yikes
VIDEO1
VIDEO2
VIDEO3
OMG!! A MAG Instrument 8 station? I used to work for them in the pre-flashlight days. Guaranteed accurate repeatability within .000050 (50 millionths, not tenths, mfg tolerances were less than half that.) Had one of the best non-aerospace QA labs I've seen. Far higher precision than the one Hardinge put on their chuckers.
Seeing that picture brought back memories of when I was 20-something and living in CA. I was at one time the only machinist (besides the owner) in the place. Then the siren song of Boeing got me to the Frozen North, but I digress...
Fascinating work here. I'm going to have to write another Widgitmaster Techniques piece in my blog I see. Some good stuff such as using the mill DRO as a CMM and leveling and indicating the CI piece in with machinist screws.
One thing though. I noticed in picture 017, you're dialing in on the pin for the cross slide. What's up with that indicator holder? I mean, it is a widgit, but it isn't THE widgit. At least it isn't the holder you sell on eBay.
Don't mind me, just a little good natured harassment.
Best,
BW
There's always room for more Widgits Bob!
Today I used my big fly-cutter to take a final pass across the top of the plate. With the head trammed, and the plate leveled, the final thickness was within .0003" parallel! My contribution to the MAG Industries Turret!
VIDEO
Next I drilled & tapped the eight mounting holes for 1/4-20 SHCS, and drilled the three 1/2" diameter flat bottom holes for the return springs!
Then I pressed out the hardened guide bushing from the old base plate, and drilled & bored the holes for the bushings new home!
The next step is to drill and ream a long .5000" diameter hole for the valve piston assembly, and that is another weekend's worth of work! I think I'll have to order a long drill bit, as the jobber's length drills are about 3/4" too short! Wish I had an Oxy-Acetylene set so I could braze an extension on an old drill bit!
During this whole process, I decided to lower the turret .750" below the centerline of the spindle, as it seemed advantageous to have long parts clear the top of the turret! That means I'll have to make all my own tool holders!
Last edited by widgitmaster; 03-18-2007 at 05:28 PM.
Regarding welding an extension to a drill:
Isn't there a technique where you put one part in the spindle of the lathe with the other held fixed on the cross slide (or tailstock)? Then run the spindle up to speed, turn it off and force the two parts together. The friction generates enough heat to weld the parts together.
I forget what the technique is called or where I heard about it. I've never tried it.
Ken
Kenneth Lerman
55 Main Street
Newtown, CT 06470
Surprisingly enough it is called friction welding. A year or so back someone had posted a link to a video showing it being done on something. I think I might have mentioned in a post that Caterpillar (the company that is) used it for welding ends onto hydraulic cylinder rods. Just about anyone who has run a CNC machine has done it inadvertently once or twice. Although normally this involves friction welding a tool into a big block of steel rather than onto a bar of equal diameter.
Now I feel a bit stupidliterally beside myself I guess. I did a search and find I am the guy who posted the video link. Ah well age does creep up on one.
looking good widgit keep posting
individual who perceives a solution and is willing to take command. Very often, that individual is crazy.
FYI, if anyone wants one, there are quite a few tooling plates of this style available on eBay at the moment. You still have to do the work Widgitmaster is doing (and then some, most have no base like his did) to adapt it to your lathe, but if you are enjoying the thread and want to "play along".
I snagged a Hardinge for potential use as a CNC toolchanger down the road.
Best,
BW
Awesome thread. Keep up the excellent work. I have a 4A 5 station turret lathe, and love the versatility, even though it has a relatively short bed.
Today I was able to spend 7 1/2 hours in the shop! I have gotten a lot done on this project!
Today I turned the new valve stem for the pneumatic clamping mechanism, made it out of 303-SS! I had to change my design to adapt everything to the new base plate, so I will need two more O-Rings for the new valve!
Then I drilled all the remaining holes on the top of the plate, as well as the little array of holes for the exhaust port! Next I drilled & tapped the 1/4 NPT input port, also on the side.
Then I placed the slab on end and rough drilled the deep hole for the valve stem, unfortunately, my long drill and new reamer have not arrived yet, so I was unable to complete the task!
Then I set the plate in the vise and milled a .125 x 45° chamfer on the top edges of the slab. So far so good! !
Widgit
Widgit, very nice. That ugly duckling chunk of cast iron is turning into a precisely machined swan!
Sorry to have missed out on whatever setup was needed to make that chamfer taper off around those circular areas. That was probably quite an interesting rotab setup.
Nice to get so much time to focus on a job. That's always when I make real progress.
Best,
BW
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