the iron dwarf Posted May 11, 2018 Share Posted May 11, 2018 have a 4th axis ( rotary table for a cnc mill ) and it has a few screws missing or damaged it is made in the US and is a HAAS HRT 310, it is recent and not an antique so can anyone tell me what threads are likely to be used the main one I need is about 3/16", measured at 0.186" or 4.7mm on the outside of the male thread and is quite fine. another thread of interest is the one for the lifting eye, measures about 7/16" and looks like our whitworth or UNC thread it weighs 438 pounds Quote Link to comment Share on other sites More sharing options...
Charles R. Stevens Posted May 11, 2018 Share Posted May 11, 2018 We use all kinds of threads, depending on the year and manufacture. ASE corse and fine threads were classics, the will have the classic 3 or 6. / marks pointing to the center. Metric fasteners will have fine and corse as well and have a number denoting grade. I would have to look up a TPI or TPMM chart to give you spacific thread counts. We have been dealing with a mix of threads for years, in the late 80’s it wasn’t uncommon to have American made cars have metric and standard faseners Quote Link to comment Share on other sites More sharing options...
the iron dwarf Posted May 11, 2018 Author Share Posted May 11, 2018 I know it is not metric, looks very similar to m5 but is just a little smaller and about the same pitch, the screws are a bit short to count the tpi on I think the item was made about 2008 casing damaged so had to remove it to bash out dents http://int.haascnc.com/we_spec1.asp?intLanguageCode=1033&id=HRT310&sizeID=310MM_ROTARY Quote Link to comment Share on other sites More sharing options...
ThomasPowers Posted May 11, 2018 Share Posted May 11, 2018 What did they say when you contacted customer support? Quote Link to comment Share on other sites More sharing options...
the iron dwarf Posted May 11, 2018 Author Share Posted May 11, 2018 not contacted them yet, some places are not happy to help when you got a few thousand $ worth of their kit from a scrapyard or they want you to only have it fixed at their authorised dealers for a lot of money an induction heater I bought for 10 uk pounds, the makers want me to pay them over 500 uk pounds so they can inspect it and test it before they supply me with a spare part costing a few pounds Quote Link to comment Share on other sites More sharing options...
Kozzy Posted May 11, 2018 Share Posted May 11, 2018 A # 10 screw is .190" dia so that might be what the 3/16" actually is. Comes in both 24 and 32 TPI standard. As to the 7/16", standard for that is either 14 or 20 TPI depending in whether it's NC or NF. Or of course it might be an oddball. Quote Link to comment Share on other sites More sharing options...
ThomasPowers Posted May 11, 2018 Share Posted May 11, 2018 Tell them you recently bought it used and when it arrived to your shop it was missing a couple of screws. Good customer service would ship you a handful at no charge. Decent would tell you what they are; bad wont; but you don't know till you ask. If talking to them doesn't work then asking the world might work. Have you asked on homeshopmachinist.net? Quote Link to comment Share on other sites More sharing options...
the iron dwarf Posted May 11, 2018 Author Share Posted May 11, 2018 this is my first place to look TP will look at the small screw again in the morning Kozzy as #10 32 sounds likely can get them locally but not at 21.45 on a friday nite but at least I have a starting point, thanks to all Quote Link to comment Share on other sites More sharing options...
Smoggy Posted May 12, 2018 Share Posted May 12, 2018 I've just found a PDF user manual with dra ing and parts list, I think will supply the sizes you need to know. I'll pm you a link. Quote Link to comment Share on other sites More sharing options...
SLAG Posted May 12, 2018 Share Posted May 12, 2018 Smoggy, Thank you. SLAG. Quote Link to comment Share on other sites More sharing options...
BIGGUNDOCTOR Posted May 12, 2018 Share Posted May 12, 2018 Sounds like a #10-32 machine screw. A note for repairs. When I worked at the Jelly Belly Candy Co we had some machines that used #10-32 screws in them. If one got stripped out you could thread in a M5 screw and get it to grab as the M5 is .010" larger in diameter and the pitch of the threads match up. Many times this kept production going until we could repair it in the shop. Quote Link to comment Share on other sites More sharing options...
the iron dwarf Posted May 12, 2018 Author Share Posted May 12, 2018 got the details and ordered the screws got 4 of the 1/4 here the tread is known as UNC and 20 of the smaller ones which is here known as UNF, each of which used to be common here before metric took over thank you guys Quote Link to comment Share on other sites More sharing options...
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