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30th Jun 2019, 12:54 PM #31Most Valued Member
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- melbourne australia
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30th Jun 2019, 01:01 PM #32Most Valued Member
- Join Date
- Jun 2007
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- sydney ( st marys )
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- 64
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In regards to offsetting the compound for threading and choosing not to try and find some theory based answer I would say generally it is opperater choice for external threads.
Some may find it easier to return the cross slide back to zero and advance with the compound, rather than having to remember what the last reading on the cross slide was, as with the offset method the setting for the depth of cut will not be changed when the tool is retracted from the cut with the cross slide.
At the end of the day which ever method you prefer, I would say that an operator should be comfortable with both methods.
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30th Jun 2019, 02:21 PM #33Most Valued Member
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- Nov 2007
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- melbourne australia
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- 3,228
Sounds good. I have a nifty little cross-slide stop so I don't need to check the cross-slide dial when winding it in again when using the offset method.
Chris
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10th Jul 2019, 11:02 PM #34
Here's the bolt for the AXA QCTP
20190710_124359.jpg
Yo can see the spanner flats to tighten it up on the compound. The thread for the compound is 12g and the end for the nut is 2.0. Had to learn to cut imperial threads with a metric leadscrew.
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11th Jul 2019, 12:59 PM #35Most Valued Member
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- Nov 2007
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- melbourne australia
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- 3,228
Boris,
I that a lamp arm attached to the back of your saddle?Chris
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11th Jul 2019, 06:49 PM #36
Yes, it has an accessory piece that sits on the back of the saddle and the lamp is mounted on/in it. The other hole was for a the coolant pipe, tap and nozzle which I removed. I don't have a need for coolant etc.
20180727_115520 (1).jpg
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29th Jul 2019, 11:00 PM #37
A quick update for those still awake.
I picked up a '100 size' AXA type QCTP from Ausee Machines and Tools (no affiliation although they were great to deal with). The actual model is 111, it's a wedge type tool post.
Best move I've ever made. Suddenly I'm not wasting time changing changing tools, shimming and setting up, I'm just getting on with the job and learning. It's amazing just how much more you learn in one session when changing tools is no longer a time-consuming chore.
Just wanted to jump on here and offer my sincere thanks for all of you guys who helped out with wise, informed comments and advice.
Cheers!
Moz
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5th Nov 2019, 08:29 AM #38Intermediate Member
- Join Date
- Sep 2016
- Location
- Adelaide
- Posts
- 27
QCTP for Hercus 260
Hi Moz -
I do also have a Hercus 260 like you and also in progress in learning this machine also getting frustrated with setting up tools and looking for shims, more than turning anything. I was advised that you posted about the QCTP and just read all about it - I shall now start the process of saving up the pennies and so fourth to get a toolpost like that - is it really as good as you describe it?? what kinda tools did you buy for it? or are you using HSS?
Just saw that you are from S.A. and your avatar indicates that you might be interested in motorcycles. Same same here. Small world
cheers
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5th Nov 2019, 06:33 PM #39
Hi JA.
Yes, it's that good. It's not perfect but it's oh, about a thousand times better than messing around shimming using a 4-way tool post. I find myself turning and learning a lot more rather than constantly messing around setting up the next tool for the next operation.
I purchased via Ausee (no affiliation) and the cost for the actual QCTP kit with a handful of tool holders was not too bad. Of course it's addictive...you soon find yourself wanting a tool holder for every tool that you have! It just speeds everything up. Click-clack, continue working. Easy.
I am using 12mm shank ebay tool holders (carbide inserts), cheap as chips, usually in kits of 4 or 5, say, standard, straight, boring bar, threading bar, parting. I wish the standard tool holders took 16mm shank tool holders but they don't - they'll hold up to around 14mm and that's it. Really not a big deal but I have some 16mm shank holders that I used to used in the 4-way that I'd like to save from permanent retirement.
I feel like the QCTP has sped up everything for me. I went from faffing around and achieving relatively little in one session (I'm time poor) to getting a lot more done. I'm even cutting threads with confidence now.
And yes, I ride, restore, modify and race motorcycles. That's what getting the lathe was originally all about for me - growing the ability to make/modify/repair bike parts.
Hope this ramble helps.
Moz
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6th Nov 2019, 12:20 PM #40Intermediate Member
- Join Date
- Sep 2016
- Location
- Adelaide
- Posts
- 27
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6th Nov 2019, 03:27 PM #41Member: Blue and white apron brigade
- Join Date
- Feb 2006
- Location
- Perth
- Posts
- 7,189
While we are on the topic of cheap QCTP here is a small experience I had recently when I purchased a couple of cheap QCTP tool holders from the Ozmestore.
The tool headers were a standard AXA 250-101 tool holder, and a 250-107 (parting blade holder).
Al my existing tool holders and the new 101 fits firmly on both locations on the QCTP, but the 107 only fits firmly one of the two holder positions.
It seems like the ram on one of the positions comes out a bit less than on the other.
When I check out the dimensions of the dovetail of the new 107 it's about 0.2 mm deeper that the the other tool holders which is too deep for the ram on one of the tool holder positions to make firm contact with the holder.
I fixed this by placing a thin washer behind the tool holder ram face - the washer has to be thin enough so all the other tool holder still fit but it now seems to be working fine.
.
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