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Old 06-16-2009, 07:11 AM   #21
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Default Re: Making a QCTP (Quick change tool post)

Quote:
Phil,

This is going to be one very nice QCTP.

Best Regards
Bob
Thanks Bob,
That's quite a complement coming from a man as skilled as yourself.
Best Regards
Phil


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Old 06-16-2009, 07:37 AM   #22
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Default Re: Making a QCTP (Quick change tool post)

Nipped out to the shed for half an hour while mum and baby are asleep.
Tapped the two holes in the leaver base and shortened a bit of rod that was already threaded with M8 on the end. I changed the specs for the leaver from 5mm to 8mm to suit the bit of rod available.









That will be all until Thursday (pay day ) when I buy the 4140 2" round bar for the wedge and 3" x 1 1/2" flat bar for the tool holders (not that I would call that flat ).

What are your thoughts on the number of tool holder I should make?

I was planning on making 5. A boring bar holder, a parting off holder and 3 general tool holders. Any others anyone can think off that would be handy?
Better to make them now and cut the dovetails in one go.

Cheers
Phil



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Old 06-16-2009, 08:00 AM   #23
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Default Re: Making a QCTP (Quick change tool post)

Very fine piece of work Phil,great looking tool
Rob

Forgot to say make lots of holders

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Old 06-16-2009, 10:47 AM   #24
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Default Re: Making a QCTP (Quick change tool post)

Phil,

You will quickly find that there is no such thing as enough tool holders
I would add to the list a small boring bar holder as I always seem to have on of my plain ones tied up with a small boring bar in it.
If funds can allow I would also add a couple more plains as it's easier to set them up now and do them all at once.

Dave

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Old 06-16-2009, 02:45 PM   #25
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Default Re: Making a QCTP (Quick change tool post)

Cheers Rob,
The dovetails will be the defining moment, I've never done them b4. I'll give anything a go though.

Thanks for the tip Dave,
It's $45AU for the steel to make 5. Not a big ask to make a few more at the same time.

On another note. The 20mm dovetail cutter I purchased was spec'd to cut a 10mm depth of cut, but when it arrived the DoC is only 7.8mm


What do you guys think about two passes to get 10mm DoC? The shank is probably recessed enough to allow that although getting a smooth finish might be a problem.
Is it wiser to reduce the dovetail depth or do the 10mm and have a vertical flat at the top of the dovetail recess (talking about the tool post body here like below).

The clearance on the tool holder might be an issue but I have a plan. ( Just smile and wave boys, just smile and wave )

Here's the idea


The first dovetail is cut as close and deep as possible with the limited depth of cut. The second dovetail has been cleaned up by running a small end mill in on an angle.

We'll see how it goes.

Cheers
Phil

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Old 06-16-2009, 04:43 PM   #26
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Default Re: Making a QCTP (Quick change tool post)

Hey Phil your post looks great as far as other tool holders you might make one for a knurling tool if you use one very often. Giving you my two cents worth about your plan of attack on milling the dovetail's can't see why it wouldn't work but that's just a opinion of a thirty eight year machinist but there is only one way to find out is to try it again good work Cliff.

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Old 06-16-2009, 05:23 PM   #27
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Default Re: Making a QCTP (Quick change tool post)

Phil,
Leaving a little off the sharp corners of the dovetails would make the tool holders less vulnerable to damage from bumping into other tools, maybe truncating the corners of both the post and holders will work.
Your tool post looks like a really solid design.

You can never have too many tool holders:



The two in the back for the knurling tool and the milling spindle are built into the accessory. The dovetail for the knurling tool is of aluminum since it doesn't have to relocate accurately. I also used aluminum for a test indicator holder.


Dave

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Old 06-17-2009, 01:38 AM   #28
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Default Re: Making a QCTP (Quick change tool post)

Quote:
Originally Posted by Cliff
Hey Phil your post looks great as far as other tool holders you might make one for a knurling tool if you use one very often. Giving you my two cents worth about your plan of attack on milling the dovetail's can't see why it wouldn't work but that's just a opinion of a thirty eight year machinist but there is only one way to find out is to try it again good work Cliff.
Thanks Cliff,
I haven't done knurling B4, but I think I'll get some wheels and make a scissor type.

Quote:
Originally Posted by DavesWimshurst
You can never have too many tool holders:


Hi Dave,
Now I've got a serious case of tool post envy.

After a good nights sleep and another think, I think I will truncate the corners a bit and also reduce the dovetail depth on both the holder and body. I could always buy the next cutter size up, but that would be more waiting and the cutter would be cutting on both sides in the first few passes.

The TI and knurling holders are a must do.

Thanks again guys
Phil
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Old 06-17-2009, 04:48 AM   #29
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Default Re: Making a QCTP (Quick change tool post)

Phil,
I had recently bought an atlas shaper and was looking for an excuse to use it!
Dave

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Old 06-17-2009, 10:07 AM   #30
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Default Re: Making a QCTP (Quick change tool post)

Phil,

I agree with Dave's comments, truncating the tip is good practice anyway

Dave

Like the second image down in post #24



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