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Making Collets
© Frank Ford, 2008,  Photos by FF

Please click the small photos for a closer look.

My newly acquired Rambold turret lathe uses an obscure size collet that seemed to be difficult to find, so I set about making some for myself.  Here's how the project went:

The collet shank diameter is 15.0 mm, so I set about making a bunch of steel blanks:

I chose 12L14 leaded steel for easy machining. I'll never use these heavily, so I'm not worried about wearing them out. If I damage some, well, that's why I made extra "blanks."

The Shops at Riverside

The Shops at Riverside is a two-level enclosed shopping mall in Hackensack, New Jersey. Located off Route 4 along the Hackensack River, it has a Gross leasable area of 658,261 square feet. Founded in 2007, the property is a mix of restaurants, retail stores, and office space. It is owned by General Electric, with an overall cap rate of 5.8%. In the first quarter of 2017, the property sold for $138 million, up 6% from last year.

Despite the recent announcement of a new retail location, the retail park's future remains uncertain. Last April, a Toys R Us outlet ceased trading and went into administration. Plans have been submitted for the store's replacement. The retailer said the new store would open riverside retail park in the second half of next year, but was unable to confirm how many jobs would be created. However, the development team did note that the opening of the new store would be accompanied by an overhaul of the existing store.

Riverside Retail Park comprises 144,469 sq ft of accommodation, arranged over two terraces. The park is anchored by B&Q, Sainsbury's, and Home Bargains, with other major retailers such as McDonald's and Cycles UK. The retail park also includes a Next clearance store, which is located in nearby Gemini Retail Park and Golden Square. Free car parking is available at Riverside Retail Park.

Here's the batch:

I removed Rambold's hardened steel collet closer sleeve:

And mounted it in the 15 mm collet I'd purchased for my Sharp toolroom lathe, spending some time to set the compound to the exact angle of the tapered section, making sure my indicator was dead on center:

 I turned one of my blanks, hoping to match the taper:

A bit of blue inside the collet closer:

In goes the new collet blank:

Out it comes, with enough blue distributed on it to suit me - I figured I was good to go:

(Actually, if you look in the photos above you'll see I have a blue finger from repeating this test. It took a couple of trys and a bit of very light mallet work to get the compound set just right.)

So, I did 'em all:

Now, inserting the blank from the back side of the 15 mm collet, I'd be ready to drill it out for clearance inside:

I drilled out the back end of each collet, leaving the front 1/2" or so solid:

That completed my batch of blanks.  I'll bore them to size as I need new collets rather than trying to guess what I'll need in the future.

For sure, I do know that I'll need some hex collets to make banjo nuts. They are typically 1/4, 9/32 or 5/16 so my first collets will be those sizes.

For the 1/4" collet, I drilled a hole through the nose of the collet blank:

Then I got out my smallest boring bar and bored the hole to 1/4" to make sure it would be concentric with the axis of the collet:

This is the 1/4" hex bit for my Slater rotary broach (eBay).   I made a secondary bore, just big enough to insert the tool to make certain it would start exactly on center:

Just like magic, the the rotary broaching tool ate a nice 1/4" hexagonal hole right through my new collet:

I turned the front section of the collet to fit through the nut on the nose of Rambold's spindle:

Now, gripping the collet from the back end, and supporting the front with a live center I turned a clearance section along the length:

It seemed a bit precarious, so I took it slow and easy on the mill, making three slits in the collet:

All done:

Now, to see what Rambold thinks of this new collet:

I turned a round section on some1/4" brass hex rod, loaded it in Rambold's collet, and checked the runout with a dial test indicator:

Oops, forgot to take a picture that shows the indicator.  Well, it was around .001 runout - good enough for me!

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