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12 Attachment(s)
Reverse spot face tool
Hi All
Two casting I am currently working on (Trunk Guides for Foden steam wagon) need some spot faces so the nuts can clamp the casting up square and flat to the cylinder block. But it is impossible to use a standard counter bore or slot drill etc. So I decided to make two reverse spot face tools. One 3/8” and the other 1/4” diameter. The tools would be mounted to a pilot tool 3/16” and 1/8” diameter respectively. Yes these can be purchased but it isn’t a tool I could see myself using that often so decided to make them.
The counter bore was made from 10mm diameter silver steel and turned down to the correct diameter once the machining of the cutting edges were completed.
Initially the first counter bore I made didn’t work as I forgot the pilot need to drive the tool and I made the hole go all the way through. So the next was made with a flat bottom hole so once the top was machined the pilot tool would lock in place like a cam. The counter bore cutting edges were machined and then transferred to the tool and cutter grinder to put the cutting angle on each edge. Then turned to correct diameter as previously mentioned.
The counter bore cutter was then machined down on the mill to the flat bottom hole so it broke through and left 2mm high spigot to locate on the pilot shaft.
Both pilot shafts were machined from mild steel and the counter bore cutters were heat treated.
The photos below will hopefully help make this all a bit clearer.
Attachment 46398One of the pilot shafts machined with a 2mm slot at 45 degrees.
Attachment 46399Cutting edges machined.
Attachment 46400Clearance angle ground on bottom edge.
Attachment 46401Both counter bores ready for milling operation.
Attachment 46402Heat treated ready to use
Attachment 46403Test fit of tool in casting.
Attachment 46404Casting clamped to drill table with reverse counter bore depth set with block.
Attachment 46405As the cutter is working in the opposite direction the block fits under the stop.
Attachment 46406First spot faces completed (3/8”diameter).
Attachment 46407Casting in position on cylinder block.
Attachment 46408 Attachment 46409This was the first one I a made and had to weld so I could lock to the pilot but hopefully shows how the cutter locks to the pilot shaft.
Thank you for taking the time to view
The Home Engineer
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Thanks thehomeengineer! We've added your Reverse Spot Face Tool to our Metalworking category,
as well as to your builder page: thehomeengineer's Homemade Tools. Your receipt:
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<a href="https://www.homemadetools.net/homemade-reverse-spot-face-tool">Reverse Spot Face Tool</a>
<span> by <a href="https://www.homemadetools.net/builder/thehomeengineer">thehomeengineer</a></span>
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Congratulations thehomeengineer - your Reverse Spot Face Tools are the Homemade Tool of the Week!
This was a difficult week to win, with some excellent homemade tools posted. Your scale Foden Steam Wagon has yielded multiple winning tools, and this is yet another example.
Some more good builds from this week:
DTI Holder by Mook
Lathe Bump Tool by Improvised DIY
Internal Thread Cutting Method by Frank S
Non Spill Oil Can by Improvised DIY
Clothes Dryer Alarm by rgsparber
Motorcycle Engine Tools by th62
Rust Removal Tool by Andrii Pysarenko
Mini Clamp by orioncons36
Square by Philip Davies
thehomeengineer - you'll be receiving a $100 prize, in your choice of Amazon, PayPal, or bitcoin. Please PM me your current email address and prize choice and I'll get it sent over right away.
This is your 13th Homemade Tool of the Week. Here are all of your Homemade Tool of the Week winning tools. Congrats again :thumbsup:
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<a href="https://www.homemadetools.net/forum/reverse-spot-face-tool-99049#post230175">Reverse Spot Face Tool</a>
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