- Thread starter Screwdriver
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Screwdriver
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It won't because the collet end doesn't fit through the colchester spindle, meaning 8 inches of stick out. I could use a steady rest but it all gets a bit tricky, especially if you are shooting for tenths.
I may end up turning a new spindle but at the moment have plenty of other stuff to get on with. This is thinking out loud really.
Screwdriver
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LOL. I know what you mean. It really does look like that but it's just a relief cut. The spindle is machined from solid with a 16mm bore running through.
Whats a generic
Whats a generic ER collet holder.?
Dieselman 63
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How did this turn out btw?
Screwdriver
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I sold it.
Screwdriver
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You know, any old standard type. Not a specific type for an obsolete machine.
ER32 is a standard size taper collet system into which you can fit any ER32 collet in a range of sizes up to the maximum that system will accept. With the George Taylor, that size is limited by the physical dimension of the spindle even if you modify it to fit.
Spindle is the very heart of the machine and is a beautifully accurate component you really don't want to be trying to reproduce. So err, I gave up and bought a Bridgeport!
WorkshopChris
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I think what Penfold was suggesting was to take something like this.>
https://www.shop-apt.co.uk/straight...Zk7kSPbio3jhdQo4UfrWCW8D6MAuGc8kaApgtEALw_wcB
That gives you ER collet holding with a shank that could be machined to the same rear profile as the collets that came with the machine matching the spindle, then retained with a draw bar.
This would give the minimum length(stick out to the existing spindle), reducing chatter and maximising the machine's capacity.
Screwdriver
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Remembering that you have to fit the new collet holder spindle into the the existing spindle before you even add the clamp and toolbit. The less than generous headroom of this machine means you'd end up with an engraving machine with six inches of stick out on the bit in a holder modified to fit a precision part.
It all seemed a bit like chasing your own tail. I think I went as far as trying to find someone who would regrind the hardened spindle to accept ER32 collets. Even then, they needed to see the actual item before they would know if it could be done and at what price.
At that stage it was still driven by a cobbled together pulley modification to the original belt drive. Beautifully made machine it was and I felt it would be a shame to spoil it.
It all seemed a bit like chasing your own tail. I think I went as far as trying to find someone who would regrind the hardened spindle to accept ER32 collets. Even then, they needed to see the actual item before they would know if it could be done and at what price.
At that stage it was still driven by a cobbled together pulley modification to the original belt drive. Beautifully made machine it was and I felt it would be a shame to spoil it.
WorkshopChris
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As a new ER collet holder would only need to be ground to suit the rear of the existing taper it shouldnt add much more than around 60mm to the overall length.
My problem is I dont have money for a Bridgeport. I am trying to get this mark II cutting to see if milling is actually for me.
Screwdriver
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My problem is I dont have money for a Bridgeport. I am trying to get this mark II cutting to see if milling is actually for me.
Neither do I but I managed to pick up a slightly broken one for cheap. It's still slightly broken but in a lot more pieces!
I never did measure the precise taper inside the quill/spindle. I don't think I did. I know the measurements I put up in those diagrams are spot on but in hindsight, wonder if you might get lucky and be able to use a drawbar collet with the "incorrect" taper. On mine an additional problem was someone had welded a drive sprocket to the top of the spindle, ruining the inside bore.
What are you going to do as a drive solution?
Screwdriver
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mine was a belt drive with a huge pulley on the spindle
slim_boy_fat
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I think mine is but can't remember now.. Lol
Mine was hollow but has a different taper.
I have found the guy who brought out the collet supplier.
Need to check my emails to refresh my memory...
That is my plan as the speed of the feed depends on the speed of the cutter....
