brightspark
Member
- Messages
- 40,329
- Location
- yarm stockton on tees
get one of these and you can use up to 3/4inch square tools https://www.ebay.co.uk/itm/Myford-T...xB0ggMKsZE_9JuIqUs2sdQF_b_vQw41caAihtEALw_wcB
- Thread starter 25.4_mechanic
- Start date
slim_boy_fat
Member
- Messages
- 29,540
- Location
- Scottish Highlands
Isn't that the type currently on his lathe?
brightspark
Member
- Messages
- 40,329
- Location
- yarm stockton on tees
no its a 4 post one which limits the size of the tools to about 15mm
slim_boy_fat
Member
- Messages
- 29,540
- Location
- Scottish Highlands
25.4_mechanic
Member
- Messages
- 1,046
- Location
- Germany, southwest
In fact, I have both.
I can only use the four-tool holder since I made myself a 3/16" Allen key.
I have found that in my pile shockingly few tools that fit in there actually work, mostly I am over centre line.
That's why I'm trying the universal holder again today:
About 0.1mm tapered over a length of about 140mm.
Different tool, wrong direction angle, but rounded insert:
In the beginning, a few times I didn't notice right away when the micrometer screw drifted when I let go to oil the cutter.
Over a length of about 140mm approx. 0.15mm tapered.
I'm not very happy
Carsten
--
brightspark
Member
- Messages
- 40,329
- Location
- yarm stockton on tees
turn your cutting tool round a bit so its cutting on the corner of the tip and not along the flat edge. that tools ok for facing off in that position but not ideal for turning down along the bar from right to left . like this and tool facing across the bed https://uk.rs-online.com/web/p/lath...QqhM7cqAwHw0ousl7-BoC_0QQAvD_BwE&gclsrc=aw.ds
prepman
Forum Supporter
- Messages
- 2,702
- Location
- Gwynedd UK
This is test bar I assume? Are you setting it up properly? Initially machine it with the tailstock. Turn down the centre section leaving a larger diameter both ends. Then without the tailstock take very very fine cuts until there is no spring cutting (bending of bar). Go back over the bar without feeding in. Then measure diameters.In fact, I have both.
I can only use the four-tool holder since I made myself a 3/16" Allen key.
I have found that in my pile shockingly few tools that fit in there actually work, mostly I am over centre line.
That's why I'm trying the universal holder again today:
View attachment 322330
About 0.1mm tapered over a length of about 140mm.
Different tool, wrong direction angle, but rounded insert:
View attachment 322333
In the beginning, a few times I didn't notice right away when the micrometer screw drifted when I let go to oil the cutter.
Over a length of about 140mm approx. 0.15mm tapered.
I'm not very happy
Carsten
--
The aim is to get it machined without the tailstock. Use a good diameter bar 50mm maybe. Check for play in headstock bearing with clock gauge using bar as a lever.. If you have piece of ground round stock then try that with clock gauge on carraige on horizontal and vertical planes.
25.4_mechanic
Member
- Messages
- 1,046
- Location
- Germany, southwest
The difficulty is that I have to shim every tool, otherwise I don't hit centre height.
Just to arrange the tool differently needs other shims because the height at the tip has changed.
All the rest is a completely incoherent pile of random turning chisels:
1) Yes, sort of. 2) Definitely not.
I'm in the process of finding out how to hit center height, each time if possible.
I had no idea how useless the heap of chisels would be after closer inspection.
... figuring out which way I should go ...
Carsten
--
slim_boy_fat
Member
- Messages
- 29,540
- Location
- Scottish Highlands
I use 12mm toolholders + carbide cutting tips from Banggood, but also have HSS from which I've ground [not very accurately ] ad hoc cutters.
] ad hoc cutters.
brightspark
Member
- Messages
- 40,329
- Location
- yarm stockton on tees
get yourself a load of strips of shims diffrent thicknesses. use old hss hacksaw blades as well grind the teeth off and cut them in to 4 inch lengths to pack up the tools to height use the center in the tailstock to find the proper center height for the tool if u havent a scribing block . dont buy these but make your own / it will give you the idea what you need https://www.micromark.com/6-piece-Shim-Set-for-Lathe-Tool-Post
25.4_mechanic
Member
- Messages
- 1,046
- Location
- Germany, southwest
Ok, tool holders cost money, carbide cutters too.
I come back to two pictures shown a few pages ago of the carbide cutters that came with the machine.
My hope is to identify them and maybe find out the right holders that way.
The labels on the boxes don't mean anything to me, I don't know which part is important and which isn't, so I'm asking you:
I come back to two pictures shown a few pages ago of the carbide cutters that came with the machine.
My hope is to identify them and maybe find out the right holders that way.
The labels on the boxes don't mean anything to me, I don't know which part is important and which isn't, so I'm asking you:
Have to look into it. Do they give precise measurments in the description?
Just started to realize that, made some first, need lots more of those.
Next thing .... on my way ...
slim_boy_fat
Member
- Messages
- 29,540
- Location
- Scottish Highlands
That's assuming that's the tailstock is adjusted correctly, which it may not be.
@25.4_mechanic Those sizes don't mean much to me but may to other Members who know better than I. Measure to see which shank size your toolpost will accept and go from there, plenty of choice on Banggood HERE. Avoid going too big/thick as you can always shim the tool to centre height, whereas you can't lower one which sits too high without milling metal off the bottom of the holder.
brightspark
Member
- Messages
- 40,329
- Location
- yarm stockton on tees
That's assuming that's the tailstock is adjusted correctly, which it may not be.
put a center in the headstock and tailstock and run them up together and you will soon see as a basic check
slim_boy_fat
Member
- Messages
- 29,540
- Location
- Scottish Highlands
^^ Yes, as long as he removes the chuck, which isn't the same thing. Remember he's still very much feeling his way and we mustn't assume he knows.
25.4_mechanic
Member
- Messages
- 1,046
- Location
- Germany, southwest
Wilco, thanks!
Closed the three-jaw chuck all the way, put a co-rotating tip in the tailstock and pushed it into the chuck. Couldn't find any deviation.
Then drilled the 20mm test rod you saw (what I just had laying around) with centre drill.
Then I drove the rotating tip into the end (a bit late I noticed that the rotating tip doesn't really want to rotate anymore, now it has a ring groove
).That's enough for me for today, a bit of Banggood searching, then it's over.
Thank you all for your patience
See you then,
Carsten
--
slim_boy_fat
Member
- Messages
- 29,540
- Location
- Scottish Highlands
Wilco, thanks!
Closed the three-jaw chuck all the way, put a co-rotating tip in the tailstock and pushed it into the chuck. Couldn't find any deviation.
Then drilled the 20mm test rod you saw (what I just had laying around) with centre drill.
Then I drove the rotating tip into the end (a bit late I noticed that the rotating tip doesn't really want to rotate anymore, now it has a ring groove
That's enough for me for today, a bit of Banggood searching, then it's over.
Thank you all for your patience
See you then,
Carsten
--
Next time you settle down with a stein, here's some viewing for you....CLICK HERE
Apologies if you've seen them before.
25.4_mechanic
Member
- Messages
- 1,046
- Location
- Germany, southwest
Next time you settle down with a stein, here's some viewing for you....CLICK HERE
Apologies if you've seen them before.
No, I hadn't found it yet, maybe because Super 7 is in the title but not ML7, but ....
... I immediately recognised the document he uses at first glance: This is from "Testing Machine Tools", the bible on the subject
by Dr. Ing. Georg Schlesinger, the pope of the subject.
Written in the 1930s, revised and expanded about seven times, not replaced until today.
It's a pity that I often lack the measuring tools ... but I will find ways.
So now looking yt.
Question: Why Banggood with the delivery times and possibly customs and not evilBay? The stuff looks the same .... It doesn't?
Good night everyone,
Carsten
--
slim_boy_fat
Member
- Messages
- 29,540
- Location
- Scottish Highlands
Recommended by John [@doubleboost] on here, search for his Youtube channel. Never had major problems with their tooling designed for people at my level of machining. I understand you're anxious to get machining but patience is a virtue.....
. Must say I'm less of a fan of eBay these days, too many problems with disappointing/fake goods. 10PCS 154.3 16110 154.3 16130 154.3 16160 YBC251 154.3 16200 YBC151 Carbide Inserts Processing Steel For CNC Lathe Turning Tool|Turning Tool| - AliExpress
Cheap Turning Tool, Buy Quality Tools Directly from China Suppliers:10PCS 154.3 16110 154.3 16130 154.3 16160 YBC251 154.3 16200 YBC151 Carbide Inserts Processing Steel For CNC Lathe Turning Tool Enjoy ✓Free Shipping Worldwide! ✓Limited Time Sale ✓Easy Return.
154.3-16265 Ybc251 100% Original Zcc-ct Carbide Insert With The Best Quality 10pcs/lot Top Sale - Buy China Zcc-ct,Tungsten Carbide Inserts,Original Inserts Product on Alibaba.com
154.3-16265 Ybc251 100% Original Zcc-ct Carbide Insert With The Best Quality 10pcs/lot Top Sale - Buy China Zcc-ct,Tungsten Carbide Inserts,Original Inserts Product on Alibaba.com
If you have access to steel pallet banding it makes good shims for tools when cut up.
