Between the front sheet metal trough and the face of the base casting. The sheet metal is attached to the face of the base casting with no gasket or sealant. Coolant running down between the Y-axis ways, runs down the front face of the casting, hits the leading edge of the sheet metal, and then seeps behind. From there it continues down the face of the casting to drip to the floor at the front of the machine. Cure- remove trough and apply a thin bead of sealant behind, and re-attach sheet metal. I have seen several other TM-1s where the opperators just applied the sealant to the surface without removing any sheet metal, and it seems to work just as well (even if in some cases it looked like someone sneezed on the machine with a caulk gun!) If the front trough were to back up with coolant (it is not very deep) I would expect them to leak at the joint with the side aprons, as there is no gasket there either (this is a continuation of the joint mentioned above.) But I keep the drain strainer clear (manually, no chip auger) so it has not been a problem.
Coolant running down between the y-axis ways, and even though in not great volume, hits the front batter of the coolant trough and splashed forward over the lip and onto the floor. I have seen and read of several other TM-1 where the opperator added a rubber sheet ‘cat-flap’ to stop this, yet allow the chips to be mucked out. Temporarily I just leaned a 12x14”piece of sheet metal up against the opening to the chute till I got around to making my own ‘cat-flap’. That is what I have been using ever since!
Where the vertical rear splash apron wings meet the lower side winds, is a gasket between the flanged joint. Unfortunately they used hydroscopic gasket material and it wicks coolant through to the back of the joint. It then collect along the edge of the flange, runs towards the machine base (it seems to be sloped slightly that way) till it reaches the end at the inside corner where it drips off to the floor. Best fix would be to replace the gasket with something better, but I got lazy and since the machine was new and relatively clean I was able to lay a neat bead of sealant in the corner. Also do the vertical four inch seam at the inboard end.
Rear end of the y-axis ball slides. You will see a notch here in the base casting at the end of the slide, and a coresponding notch in the side sheet metal panel. There is a gasket or gasket sealant behind this panel, but it is not very good or was not applied completely, as I had a leak on one side. Again, coolant leaked behind the sheet metal, down the side of the base casting, to the floor. It looked like a bother to remove all this sheet metal, so again a surface applied bead of caulk did the trick.
Just to the rear of this notch mentioned, is a hole in the back wing apron to allow the Y-axis way cover to pass through. Between the casting and the sheet metal that forms a tunnel for the way cover is a 2x3/8” gap open right to the elements. There does not seem to be much of a problem with coolant splashing out this opening, but coolant collecting on top of the casting runs off the back edge and right out of the machine. There was no easy way to make a tin patch for this, so again the gap was filled in with caulk. By using latex, there was the opportunity to smooth it out a little with one’s finger so did not look too cheesy. It is considerably more difficult to smooth out silicone. The tunnels that these way covers project into are not in themselves sealed in any manner. Indeed they are just channels with the side facing the base casting completely open, meant only to protect the operator from moving parts, should they be hiding under the back of the machine, as they are want to do. This looked like a major potential leak too, but has not been a problem in practice. Little coolant seems to get back into the tunnel, either by splash or runoff from the way covers. Since the floor of the tunnel is about a 1/8” above the casting, the caulk spanning the gap diverts the coolant collecting on top of the base casting to the side.
So now the only leaks are what simply splashes out of the machining envelope, being as it is a non-enclosed model.