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3rd Jan 2016, 07:09 PM #1.
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Vice Stop ( or why the vice is still not painted Michael )
A few years ago I watched a YouTube clip showing the operation of an Aciera F3 mill and quite liked the vice stop shown at 7:35 - https://www.youtube.com/watch?v=l-PPh8KFjMM
A search online resulted in finding a stop made by a Swiss firm, Marwa. Their stop appeared more versatile than the one shown in the clip because the stop end was removable facilitating the use of the tool as an indicator stand. I have a few indicator stands but nothing really rigid enough to support some of my heavy indicators and those indicators, Compac and Cary, do not have rear mounting lugs.
The chances of locating a Marwa looked pretty slim so I thought I would have a go at something similar. Marwa used a 7/8" diameter post. I increased the diameter of mine to 30mm because it would allow the fitting of the indicator support from my comparator stand. I bought 300mm of 4140 chrome bar from Bohler and 300mm of chromed case hardened ground bar from an eBay seller specialising in DIY CNC gear. The clamp body is 4E cast iron and the bar clamp bar and cup, 1045. The handle is a German Kipp purchased cheaply from the States on eBay.
Machining the 22mm AF hex on the post involved an improvised tailstock and having the dividing head and its saddle dangling off the end of the mill's table. The 22mm matches the mill's drawbar's hex.
The Marwa has a large knob end to support the stop finger in 3 positions. I made mine flat. The finger is 4140 with a standard M8 13mm AF hex.
I will probably make a couple of extra bits. One should be an adjustable length stop finger, the hex would be replaced by a knurled ring and it would have a knurled locking ring. At present, when the clamp is tightened the finger unavoidably moves and this exerts pressure on an item in a vice if the finger was positioned after the item was clamped in the vice. No problem if the finger was there first.
The other bit and a bit trickier could be a fine adjuster for the indicators. The springs in my Noga and little Compac stand can't cope with the weight of the heavy indicators.
The parallelogram adjustment mechanism on the comparator might show promise if it could be miniturised.
Throughout this project I used the universal vice Michael procured for me. Its stop worked wonderfully as did the vice's indexing. Hard to paint something when it needs to be used.
BT
PS sadly I found out that the Starrett parallel sitting under the 1um Cary has a 9um dip in the middle on one edge.
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3rd Jan 2016, 08:19 PM #2Philomath in training
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That adjustment device is an interesting one. What sort of range does it have?
I have some blue spring steel if you want to try making one. As I have a suitable punch and shears it may be easier if you send a sketch and I'll send over some parts.
Wondering whether it is better mounted on a pole like that or as a lugged item that would attach to the end of boom in photo 13?
Michael
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3rd Jan 2016, 08:20 PM #3Most Valued Member
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Nice job Bob. What type of slitting saw blade is that?
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4th Jan 2016, 07:50 PM #4.
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Thanks Chris,
The saw is a 6" x 1/16" made by TTC in England. I have a similar saw made by Brown and Sharpe and in their 1951 catalogue there is a description - these saws are designed to take deep cuts with free cutting action, thus increasing production and lessening cutter breakage. The design allows the chips to be carried out of the deep slot without jamming. Unusually large chip space is provided and in addition to the pockets at the sides of the teeth, the sides of the saws are recessed. There is also concavity on the lateral cutting edges. Thess extra clearances reduce rubbing and dragging and thus minimize heating and jamming tendencies.
Ha! it would have been quicker to photograph and paste the bloody page. I have three of these saws and paid less than twenty bucks each for them new on US eBay. Extremely handy things to have.
Bob.
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5th Jan 2016, 09:01 PM #5Most Valued Member
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- Nov 2007
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- melbourne australia
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