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On 01/07/2021 at 18:05, snitzl said:

Hi Michael, If that's the case, then I will trust your word and try Phosphoric Acid out on a test piece some time in the near future ( But not on the BCA ).

Pete,

 

You saw my example above. I didn't trust the reports either. But the result was convincing, so I tried it on other examples and it worked to my satisfaction. Nevertheless, it is always a good idea to try some test pieces first.

 

Michael

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Managed to complete all the de-rusting on the BCA jig borer and most of the part's have turned out very nice, only the chrome handle's and pulley wheel showed serious sign's of pitting from the rust.  I'll probably do a little restoration on the handle's later in the year. About 1 litre of the 'Evapo-Rust' solution has either evaporated or been wiped off the part's as removed from the solution which is still active.

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The 'Epavo-Rust' gel was used on the vertical face, extra gel was applied periodically to area's that had dried, other's have suggested covering with cling film to prevent evaporation.

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The head was totally stripped, here's a pic taken during the re-assemble.

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The chrome handle's were very rusty in place's and the chrome had flaked, pitting from the rust is very visible.

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Pitting on the pulley was expected.

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The head assembly is now ready for installation.

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Job Done.

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Looks great!

I would keep an eye on the surfaces for the next couple of days/weeks to make sure that all active Evapo-rust has been removed. Black spots and/or slight rust would indicate that there is still something going on. The oil you put on the surfaces has a certain capability to compensate an acidic environment, but you surely do not want to take any risk.

 

Michael

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  • 3 weeks later...

One of the pitfall's with being obsessed with old machinery is tooling, or the lack of it. Take my BCA for example, the machine came with three imperial collet's, an 1/8", 1/4" , 3/8" and a small drill chuck. Recently, I purchased an ER11 collet holder and a few collet's so that I had an improved method for mounting dental burs, small metric cutter's, engraver cutter's and diamond bur's, I use these small cutter's quite often when machining model railway component's. This small adapter was mounted in the 1/4" collet and worked well, but the adapter position could change / creep during machining, so here are a few images as a reminder to myself and hopefully of some help to RMWEB'er's contemplating making a similar collet adapter.

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3/4" diameter, EN8 bright carbon steel mounted in the 3 jaw, one end is threaded M9 x 1, the shank is turned to 7/16" dia, end is centre drilled.

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Setting the 20 deg angle on the compound slide : 20mm movement on the compound slide = 269 thou on the dial gauge.

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The 20 deg angle added.

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Using the same 14mm x .75 thread as used on the previously purchased ER11 adapter, I will also use the same 'Nut', which are plentiful on the bay. The die was adjusted so that the thread was cut in three stages.

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Collet is first drilled and then bored out with the compound slide set at 8 deg.

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Checking the fit with a ER11 collet.

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An M9 x 1 split nut is made from a piece of brass, the nut will protect the thread from the drive dog when machining between centres.

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With the adapter mounted between centres, the shank and 20 deg angular section's are remachined to size. Diameter of the shank is reduced from 7/16" to 10.97mm. Had major delay here getting the tailstock aligned with the headstock.

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Adding an 1/8" slot on the Herbert Mill.

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Couple of flats machined for a 12mm AF spanner.

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Job Done.

 

Edited by snitzl
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Managed to make a few more collet adaptor's for the BCA using what was left of the 3ft of 3/4" dia EN8 bright carbon steel purchased for the ER11 Collet Adaptor, it's a good job that I didn't buy 6ft.

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Collet adaptor's for a JT0 drill chuck, JT1 drill chuck x 2 and a 4mm Spotting Drill.

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Three slitting saw arbors in 3/8", 1/2" and 5/8".

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.............

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....

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Job Done.

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On 30/05/2020 at 11:13, Vecchio said:

This will kill the edges... 

 

There was a time Glenfiddich was sold in very useful metal boxes - I kept several and one is my milling cutters storage....

So I bought the single malt just for the boxes :D

 

49951767017_e153740a2f_c.jpg20200530_110357 

Just to come back to the old subject of tool storage - I must have been pretty bored recently, as I made a new box for my drill bits. And of course it fits into the drawer below the mill/drill.

 

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And now in the drawer...

 

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Managed to make some headway with the BCA tooling so hopefully the machine will be ready to use during the winter month's, still need to do a modification to the motor mount to make it easier to adjust the motor height and I also fancy an ER11 chuck that mounts on the rotary table and is self centred by a dowel. Here's a mounting plate for a 3 jaw chuck that mount's on the rotary table.

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Machining the plate on the Boley Leinen lathe.

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Over on the Herbert OV mill - Adding clamping slot's and three holes to secure the scroll chuck.

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Part's gathered for assembly.

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Look's like one or two bur's need removing from the clamping slot, but otherise - Done.

 

Thanks for Looking.

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Here's the modification to the motor mount to make it easier to adjust the motor height and tension, this became necessary when I removed the origninal 240V AC motor and replaced it with a digital variable speed sewing machine motor, I've kept all the original fitting's just in case there's a need to revert back.

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Started with the main block in aluminium, there was only just enough room on the Herbert to drill and ream the 14mm diameter x 85mm length hole - Had to use morse tapered drill's and reamer, no room for a chuck.

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Managed to find some Clarkson 'C' type autolock collet's on the Bay, so now I can use the larger collet size's.

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With the main block and an unmade component in Aluminium, the remaining part's were made from mild steel.

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Here are the main part's assembled, the aluminium extrusion was a lucky find from the scrap bucket.

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The two steel screw's with cross hole's in the head actually secure the tension of the belt and not the height as might be expected, the height can be adusted with the piece yet to be fitted in the above picture. ( Height can also be set by the mounting bolt ).

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The original bracket that connect's directly to the motor was retained.

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Here is the new motor and bracket assembled to the BCA.

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A closer look for clarity - The modification work's fine, only long term use will prove it's worth.

 

Regards Pete

 

Edited by snitzl
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This should be the last of the tooling I had in mind to build this season, it's an ER11 adaptor plate that mount's on the rotary table and should be suitable for machining romford type axles and steam valves.

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Construction is a combination of the ER11 collet adaptor and the chuck adaptor previously posted.

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Clamping slot's added on the Herbert OV miller.

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A removable dowel on the underside ensures concentricity with the rotary table.

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As before, the ER11 nut was purchased cheaply from the Bay.

 

Pete

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