07-29-2016, 02:36 AM
Hello All,
It's not uncommon to see guys here making QCTP tool holders, what I've not seen is anyone making Dickson style holders,
They are more common here in the UK I figure,
My Colchester Mascot came to me with no compound slide but with a hydraulic copying attachment which had it's own QCTP on a very short offsetting slide, I mounted it in the normal toolpost position thinking the offsetting slide would allow thread cutting and with the intent of fitting a taper turning attachment for any taper turning also I was going to build this in a way as to allow basic copy turning too but not using the complex hydraulic copy turning attachment for various reasons.
So QCTP mounted the only problem was I only had one standard holder... Not ideal.... Ebay to the rescue, nope not this time, it was my plan until a little research found holders for my unusually large QCTP (about 125mm across the main block) were going to cost from £45 up to who knows what, some were £70 each buy it now, So I decided not to buy them ever, instead I'd make them.
The first step was to measure what size these were and find a specification or maybe even a drawing, the most critical dimension is the pitch centres of the locating "peaks" luckily I had that one holder so all i did was clamp two identical ground dowells into the valleys in the holder measure the distance across the outside of the dowells and take away one dowell diameter. After all the setting up the measurement was exactly 100mm, Hmmm how would I remember such an obscure number.
To the Internet...
After a few hours searching I lost interest in finding a sketch and went to plan b, I made my own, it's all pretty simple stuff, the only tricky part was in getting the "t" slot at exactly the same height vs the locating valleys as this is critical to the clamping force available, not to worry as "I have a plan".
But right now I'm out of time so I'll get back to this later, photos then.
regards
Rick
It's not uncommon to see guys here making QCTP tool holders, what I've not seen is anyone making Dickson style holders,
They are more common here in the UK I figure,
My Colchester Mascot came to me with no compound slide but with a hydraulic copying attachment which had it's own QCTP on a very short offsetting slide, I mounted it in the normal toolpost position thinking the offsetting slide would allow thread cutting and with the intent of fitting a taper turning attachment for any taper turning also I was going to build this in a way as to allow basic copy turning too but not using the complex hydraulic copy turning attachment for various reasons.
So QCTP mounted the only problem was I only had one standard holder... Not ideal.... Ebay to the rescue, nope not this time, it was my plan until a little research found holders for my unusually large QCTP (about 125mm across the main block) were going to cost from £45 up to who knows what, some were £70 each buy it now, So I decided not to buy them ever, instead I'd make them.
The first step was to measure what size these were and find a specification or maybe even a drawing, the most critical dimension is the pitch centres of the locating "peaks" luckily I had that one holder so all i did was clamp two identical ground dowells into the valleys in the holder measure the distance across the outside of the dowells and take away one dowell diameter. After all the setting up the measurement was exactly 100mm, Hmmm how would I remember such an obscure number.
To the Internet...
After a few hours searching I lost interest in finding a sketch and went to plan b, I made my own, it's all pretty simple stuff, the only tricky part was in getting the "t" slot at exactly the same height vs the locating valleys as this is critical to the clamping force available, not to worry as "I have a plan".
But right now I'm out of time so I'll get back to this later, photos then.
regards
Rick