Recent Posts

Pages: [1] 2 3 ... 10
I realised that getting the coolant tank where it needs to be might be a bit of an issue, as the workshop is a bit cramped now (!) so I made up a bit of wood to act as an analogue of the tank  - much easier and lighter to manipulate - and in fact there is no problem.

But crawling on hands and knees to see if there was enough vertical clearance to put the tank on rollers (there may be) I made a DISCOVERY . There is a further big panel that can be removed at the back of the lathe (it's about 1 metre square) that I had previously missed. Taking it off it revealed that the original top of the coolant tank has been stuffed in there along with the coolant pick up and pump - just as well I found it before anything starts moving as the pipes are laying on the Z ballscrew. BTW the Z servo motor is HUGE !

Being able to get my head in the back of the machine here has let me have a better look at a mystery louvred metal box fixed on the rear of the axis drive amplifier cabinet. It's 15" wide x 9" deep  x 20" tall, has a single umbilical cord of Adaptaflex trunking going into it and absolutely no markings what so ever. I suspect that it houses a transformer or maybe from the shape several transformers  :scratch: Perhaps I'll be able to open it up sometime.
Project Logs / Re: my way to billd a stuart 10 horizontal engine
« Last post by mechman48 on Today at 05:36:58 AM »
Looking good Bob; I made one similar a while back a S50H,  works a treat when set up...

Project Logs / Re: Building a New Lathe
« Last post by awemawson on Today at 03:42:37 AM »
When pressing a bearing into a close fitting journal a LITTLE bit of chatter marks on the bore is a distinct advantage. The  tight fitting bearing will slightly deform the ridges, and if you are using Loctite the troughs give it somewhere to sit without being wiped off.

Project Logs / Re: Building a New Lathe
« Last post by vtsteam on June 18, 2018, 10:25:58 PM »
I was asked about chatter. I've debated whether to answer. It's easy to make generalizations, and it's always the specifics that matter. You have to be observant and, well, flexible.

In a small lathe or flexible boring operation, yes chatter happens. But it's not necessarily a negative. Chatter is nature's way of telling you to slow down. Or sharpen your tool angles differently to suit the material. Or increase the feed. Or reduce the tooth profile. Or check that some part of your setup is starting to get loose. Or that you need to increase pressure in your gib screws. Or that you're too impatient. It's an alarm bell. You shouldn't get mad at it. It's there to help you do something different than you're doing.

It's something to figure out. It's something to make you a better, more skillful and knowledgeable operator. It's a set of instructions for lathe design. If things work out perfectly, you don't learn anything.

The first thing I produced after building my Gingery lathe was chatter.

Then I learned more about tool sharpening.
New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by WeldingRod on June 18, 2018, 08:37:51 PM »
Truck bed liner.  Make sure they heat it before applying.  My father in law made a mobile steel pool lined with the stuff 10+ years ago.  Still going strong!

Sent from my SAMSUNG-SM-G891A using Tapatalk

New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by DICKEYBIRD on June 18, 2018, 06:42:25 PM »
TSuggestions please for a suitable oil proof paint that will stand total immersion  for long periods.
POR15 gas tank sealer maybe?  I used some of their rust paint on a rusty Ford floor pan & it did very well.  Dries glass-hard & seems to be very inert.  I would think their gas tank sealer would be even better.
Project Logs / Re: Building a New Lathe
« Last post by vtsteam on June 18, 2018, 06:29:32 PM »
Well, one more journal to go, but the first one done means the end is in sight.

For those who haven't tried this: a little spring in the boring arbor is helpful in getting the final diameter right. It never cuts to full depth on first pass. For instance, if I set the boring tool out 4 thousandths the first cut will be maybe 2 thou (4 for diameter), the second cut one thou more (2 on diam), and the third cut maybe a half (one thou on diam) , and so on, until you reach the chatter point. So if you play this right by advancing the tool just a little past final size you can ease right down to where you want it in very small steps without resetting the tool, testing each pass as you go with the homemade gauge. When it just fits, you're done.

Rigidity is a plus in a lathe, but you can work with a less than perfect setup to get the results you want. It just takes more time, and understanding. Since this is a one-off situation (the finished lathe will be a much more rigid boring platform) boring the headstock before it is fixed in place with a 24" long  boring bar is a little tedious, but certainly tolerable, considering this kind of setup won't be needed again.
Project Logs / Re: Building a New Lathe
« Last post by awemawson on June 18, 2018, 05:19:27 PM »
Excellent Steve - that must be quite a relief to complete this phase  :thumbup:
Project Logs / Re: Building a New Lathe
« Last post by vtsteam on June 18, 2018, 05:17:17 PM »
The gauge worked perfectly in sneaking up on the final diameter. The final fit is nice and close, and I'm happy. Hope the other one comes out as well.

One of the things to remember is that this type of boring has no actual lathe adjustment or graduation at this stage in the construction. It's all a matter of moving the cutting bit out of the boring bar small amounts at a time and re-tightening the setscrews. So it feels like quite a victory to hit the diameter right on the money.
Project Logs / Re: Building a New Lathe
« Last post by vtsteam on June 18, 2018, 05:14:00 PM »
And after boring all morning, we have a bearing journal!  :ddb:


Pages: [1] 2 3 ... 10