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| Lathe mounted slotting attachment |
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| BaronJ:
--- Quote from: Spurry on December 05, 2016, 11:55:55 AM ---Thanks for the interest. :clap: Baron - could I ask what the total ram travel is, distance between the centres of pivot and the handle, and length of handle. Is the ratio about right for the amount of effort needed? Pete --- End quote --- Hi pete, From memory without having to go into the workshop tonight. :coffee: The travel is about 1" (25mm) The handle to pivot ratio is 12. FWIW the ram was made from an old pulley key, machined to give a square section and the end drilled to take the tool bit with a 1/4" BSF allen grubscrew to hold it in place. The body is made from a tool holder that fits into the QCTP. The brass adjusting screw was fitted to remove any play whilst giving free movement. Note that the ram runs on thin brass (0.4mm thick) strips inserted top and bottom. This prevents steel on steel galling under pressure. The handle is a 13" length of silver steel with a heat shrink hand grip. I have some pictures of its construction if you want to see its bits. |
| Spurry:
Hi Baron Thanks for the info. :thumbup: I have already ordered some stuff for my original design, some of which arrived today. A piece of cast iron bar 60mm sq x 150mm and 4 pivot bolts. I await the 22mm silver steel for the ram. Currently trying to rearrange things to suit a new design, a bit in line with the one Rob shows above. Thanks again Pete |
| Spurry:
The new design will be based loosely on Rob W's slotter from the original MEW article from 1991. Main difference will be no casting used. (CES appear bashful about price and availability of stock.) Their casting is designed to be fitted to the cross slide, whereas I prefer the top slide placement. Main disadvantage of mine is that I cannot have the ram and pivot points on opposite sides of the main retaining stud, as the cross slide runs off it's thread. Some sizes have been altered for material I had in stock. The pivots will utilise allen headed shoulder bolts. A start has been made on the handle, and pivot links so far. The two sets of pivot links were drilled and reamed separately using DRO, fitted with the bolts to confirm accuracy. Pete |
| John Rudd:
Looks good Pete, I did look at the casting on CES, but like you couldnt see the price....annoying really! I would have suggested it but for that reason.....I have one on my list somewhere.... :scratch: the casting is currently wrapped in newsprint under the bench.... :dremel: |
| Spurry:
--- Quote from: John Rudd on December 09, 2016, 07:54:26 AM ---Looks good Pete, I did look at the casting on CES, but like you couldnt see the price....annoying really! --- End quote --- Thanks John. I got as far as sending them a price-request email. A second email requesting the last price it sold for, goes unanswered. I also asked for the units mentioned under cast iron bar, no response on that either. You can select 1 or more units, but no mention of what - mm, cm, inch, foot, yard or metre. :doh: Pete |
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