Quill feed trip handle bracket - replace w/ Bridgport part?

[jimmcw]

Long shot but: The quill trip handle bracket (which was cast, fwiw) broke at the handle pivot. Of course by eye, it looks identical to the Bridgeport J-head replacement part which I can find easily online (H&W, eBay, etc). I wonder if anyone has any experience with this particular part regarding replacing w/ the Bridgeport part.

Yes - I could make one, but I have a list of projects and this wasn't on it! I am hoping I can just buy one. I'm still recovering from sticker shock from previous esquires re: spare parts directly to Lagun, lol. I will explore that if I can't determine the Bridgeport part will work directly or w/ minor mods, and that answer could drive me to making my own. I'd just give the Bridgeport part a go if it was a $20 part, but after shipping it is more like $70-$80.



Here is a picture of the Bridgeport replacement part:

 

[jimmcw]

I got the part off - was more tedious than I expected. Had to use a puller to get it off the shaft. But now I have some dimensions and realize that (of course) the two bores on this part are for metric-dimensions shafts, 12mm and 16mm. And the pin that goes through the handle is 5mm - the corresponding bore and support for that is what broke off on my part.

Anyway - I'm assuming (?) Bridgeport uses Imperial measurements for the most part but I'm still interested to hear if anyone has input. But if it is close ... I can always remove material. Harder to add

I now realize that the support for the pin, that broke off today, was in fact only half of the support - the back piece must have been missing since before I acquired the mill and I've just never noticed. I can still operate the lever by just fitting it in and pushing up as I rotate, which made me think ... maybe JB Weld as a temporary fix?

 

[GeneT45]

It's a bit of a risk, because they probably won't measure anything for you, but you could try Grizzly for a spare. I'd be happy to make in situ measurements of mine (G9901 - no longer sold), if that would help.

GsT

 

[jimmcw]

It's a bit of a risk, because they probably won't measure anything for you, but you could try Grizzly for a spare. I'd be happy to make in situ measurements of mine (G9901 - no longer sold), if that would help.

GsT

Appreciate the offer - I've attached a couple of pictures I sent to someone selling what looks to be a Lagun part on eBay showing the dimensions I've measured. (FYI first picture is from my part, the other from his add).

I contacted H&W Machine Repair and they confirmed that the Bridgeport part is not going to work. I also went ahead and contacted Lagun - they only sell a complete assembly for $850. At that price I'm considering to just make the bracket - most difficult part will be getting the dimensions right, particularly the xyz offsets for the axis on the two key bores (16mm and 12mm in my pics).

If I go that route I think I'll make a model and 3D print it to nail down the dims, and then machine. I'm even considering just 3D printing the part and pressing in some brass or bronze inserts for the bores. There is not a lot of stress on the part, no radial loads to speak of except on that small 5mm bore, which was the failure point in my case. idk. Hope I find another solution.

Anyway - appreciate it if you could compare my measurements to your Grizzly part - maybe you can measure the shaft diameters?

 

[jimmcw]

And Lagun weighed in with the OEM replacement option: They only sell the complete assembly with the handle and slide mechanism, not just the bracket I need, and all that for "only" $850 (not including tax and shipping). If I was a production shop I'd say "shut up and take my money" but I'm a hobbyist. So I'm going to keep pursuing other options.

 

[GeneT45]

I measure 16mm for the cross bore (same as your pics) and 5mm for the hinge pin. The two bolt holes are ~41mm apart. The shaft that the handwheel rides on is 14mm. I'm not seeing anything that's not aligned with either of your pictures.

I can't measure the boss that seats in the head without disassembly and I have a project on the mill right now, but once that's cleared I can check it out for you.

GsT

 

[CJ5Dave]

I bet Ebay or Amazon can provide. May not be Lagun level quality part, but adequate for hobbyist use.

 

[jimmcw]

I measure 16mm for the cross bore (same as your pics) and 5mm for the hinge pin. The two bolt holes are ~41mm apart. The shaft that the handwheel rides on is 14mm. I'm not seeing anything that's not aligned with either of your pictures.

I can't measure the boss that seats in the head without disassembly and I have a project on the mill right now, but once that's cleared I can check it out for you.

GsT

Thanks so much. I did a check on the bolt hole spacing and it could well be 41mm - I was just holding calipers up between perceived centers. The handweel shaft diameter difference (my 12mm vs your 14mm) I could work around with a pressed in brass insert.

That said - the one I found on eBay shows promise. The seller said as far as he can tell my dimensions match his, and he takes returns, so I'm going to go for that. It is a hassle to remove that part to measure the boss on the back - I appreciate the offer but I'd hold off on that. I'm hoping this eBay part will work. If it works I'll be in business for ~$50, if it doesn't I'll be back on the hunt and out for ~ $20 shipping - well worth the gamble. Coming from Canada so will take a week or more. I'll post follow-ups.

Here is the one I found - I post a picture because eBay listing links go stale fast:

Milling Machine Feed Trip Bracket | eBay

Find many great new & used options and get the best deals for Milling Machine Feed Trip Bracket at the best online prices at eBay! Free shipping for many products!

www.ebay.com

 

[Firstram]

If you’re not set up to do it, have a local company braze it back together. Unless I’m missing something, that’s an easy repair!

 

[jimmcw]

If you’re not set up to do it, have a local company braze it back together. Unless I’m missing something, that’s an easy repair!

Unfortunately, I am missing a piece. The pin for the handle goes through two “tabs” with bores for the pin, and I only have one, which broke off as I was using the mill. The other, which is behind and out of sight, must have been already broken off before I purchased the mill. (Look carefully at the second picture in this thread and you will see what i mean). So I could braze the one tab back on, but I don’t know how long that would last. I could also machine a flat surface and braze new homemade tabs - that had occurred to me. But getting the location of the pin-axis would be tricky (but doable). Backup plans. Not a lot of material to play with though.


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